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12zzoj
Would it be possible to create a human chimera?
I am reading about the production of knockout mice. An embryo is created through normal fertilization. Then, embryonic stem cells from a third "parent" are inserted into the blastocyst-stage embryo. The result is a chimera mouse that contains cells derived from two different strains. It essentially has the cells of two different organisms. Would this be possible with humans?
askscience
{ "a_id": [ "c6zl2da" ], "text": [ "Intentionally creating a human chimera is likely way over the ethics line, but it does happen naturally on occasion with twins merging into a single fetus." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Would it be possible to create a human chimera? I am reading about the production of knockout mice. An embryo is created through normal fertilization. Then, embryonic stem cells from a third "parent" are inserted into the blastocyst-stage embryo. The result is a chimera mouse that contains cells derived from two different strains. It essentially has the cells of two different organisms. Would this be possible with humans?
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1h67oi
Can cats digest keratin?
askscience
{ "a_id": [ "car8t2k" ], "text": [ "That's disgusting, and no, mammals cannot digest keratin, which is why cats cough up hairballs. I doubt any cats are treating his litter as nutrition.\n\nWhat your friend is feeding, however, are [biting lice](_URL_0_), [clothes moths](_URL_1_), and keratinophilic fungi species." ], "score": [ 11 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://hilo.hawaii.edu/uhh/faculty/tsutsumi/images/mallophaga_003.jpg", "http://www.johnsonpestcontrol.com/wp-content/uploads/2011/02/comclothesmoth.jpg" ] }
Can cats digest keratin?
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1u9ulz
Is there a term for a humans ability to understand how many objects are in front of them without having to think about it? (ie - 3 people sitting at a table vs 50 people in a line). Are there other species that have a higher tolerance to this?
We don't have to count or think about it when we see a small number of objects, however once that goes above 5 or 6 we do have to think a little harder and begin counting. Is there a term for this? And are there other species that are able to see a higher number of objects and know how many there are?
askscience
{ "a_id": [ "ceg3zdx" ], "text": [ "Great question! The ability to instantly and effortlessly count a small number of objects is called subitizing or subitization.\n\n_URL_1_\n\nThe ability to approximately represent larger numbers is known as, you guessed it, the approximate number system.\n\n_URL_0_\n\nThere's loads of research into these systems. I know most about their development in children (see work by Susan Carey, Elizabeth Spelke, and their collaborators).\n\nAs for whether other species have a different subitization limit, I don't know! Good question..." ], "score": [ 7 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Approximate_number_system", "http://en.wikipedia.org/wiki/Subitizing" ] }
Is there a term for a humans ability to understand how many objects are in front of them without having to think about it? (ie - 3 people sitting at a table vs 50 people in a line). Are there other species that have a higher tolerance to this? We don't have to count or think about it when we see a small number of objects, however once that goes above 5 or 6 we do have to think a little harder and begin counting. Is there a term for this? And are there other species that are able to see a higher number of objects and know how many there are?
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147oka
These questions are about the Earth and Matter
This is a two part question, but first here are three statements that lead me to asking them: The Earth has layers that can be connected to different time periods in her history. Also, to my understanding, matter cannot be lost or gained. However every plant / animal starts off as one cell and ends with a massive number of cells. With that being said, here are my questions: * If matter is never gained, then how has the Earth gained each layer? I know it's from dead plants and animals. But if no matter can be gained, how can this happen? * Since there are layers of the Earth, then was the Earth smaller billions of years ago? Will it continue growing until life is extinguished?
askscience
{ "a_id": [ "c7aktnb", "c7alwhz", "c7bdylg" ], "text": [ "The layers you are referring to are layers of sediment deposited around Earth. Every grain of sand/fleck of ash/cell of plant matter deposited in a sedimentary layer was removed from another location. This is erosion. You might be interested in relevant articles pertaining to the rock cycle.\n\nThe Earth was not smaller billions of years ago*, and thus will not continue growing.\n\n*The Earth does gain a slight amount of mass from capture of meteors and other space debris.\n\nLastly, plants and animals do grow, but don't generate matter as you are hinting. Plants gain mass by absorbing nutrients from the soil, and using sunlight as the energy source to build cells from these nutrients. Animals grow by eating things.\n\nEdit: spelling. (although pants can grow too.)", "Sediment is merely being passed around the Earth. Think about mountains for a minute: they are not having sediment deposited on it, they are being eroded away. Where does that stuff go? Into the low areas making those layers you mentioned earlier. Sometimes that basin gets uplifted and made into mountains and that sediment is then re-eroded and deposited somewhere else in a basin. \n\nIt's just a game of hot potato basically", "spthirtythree gives a good summary. I would just add that you need to consider that these layers being added are part of a system of redistribution and burial that doesn't gain a net upwards movement. Sediments (layers) deposit in basins precisely because there is a gap there that can be filled, and this is uaully due to some process *lowering* that land like a rift which lowers the surface. So although a layer is added to the top, that doesn't mean the Earth's surface becomes higher in that area (over geological time scales). \n\nConsider this image _URL_0_\n\nYou see how the top layer of sediment is at the current surface. It's important to understand that the layer at the bottom of the stack was also at the surface when that sediment was deposited. Subsequent movement on that fault then caused that sediment layer to be buried. So, although layers of sediment are \"built up\", the actual surface does not get any higher." ], "score": [ 7, 3, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.rci.rutgers.edu/~schlisch/103web/Newarkbasin/synsed.html" ] }
These questions are about the Earth and Matter This is a two part question, but first here are three statements that lead me to asking them: The Earth has layers that can be connected to different time periods in her history. Also, to my understanding, matter cannot be lost or gained. However every plant / animal starts off as one cell and ends with a massive number of cells. With that being said, here are my questions: * If matter is never gained, then how has the Earth gained each layer? I know it's from dead plants and animals. But if no matter can be gained, how can this happen? * Since there are layers of the Earth, then was the Earth smaller billions of years ago? Will it continue growing until life is extinguished?
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q14jp
Can we get proper scientific articles (not sensationalist news stories) that talk about NOAA's "mystery sounds", like Upsweep, Bloop, etc.?
The best I could find were NewScientist articles, but those were pretty shallow. (No pun intended.)
askscience
{ "a_id": [ "c3tvmw3", "c3tz7ko" ], "text": [ "[here's a PDF link to the official summary of the research done using the Equatorial Pacific Ocean autonomous hydrophone array](_URL_2_), as well as the [abstract](_URL_1_)\n\nIt explains the various characteristics and origins of the sounds detected by the hydrophone array. As for the unknown sounds, very little progress has been made towards explanations. It has been argued that many of the sounds result from large masses of ice in Antarctica either calving, splitting, or scraping the surface. Such vibrations from the friction in the ice are of very low frequencies. Sadly, I can't find any peer-reviewed papers attempting to explain the origins of the sounds, so for now we only have speculation from the scientists involved in the research.\n\nEdit: As a bonus, [Watch this video](_URL_0_), then imagine that happening on a continental scale. The larger size of ice-masses along the coast of antarctica may produce similar sounds at a much lower frequency, which is where the speculation of ice calving and scraping likely comes from.", "Science doesn't speculate in the absence of data. There simply isn't enough data about Bloop and mysteries like it to do anything but make guesses. While we are waiting for more data and additional incidences, they will take a backburner for the time being." ], "score": [ 73, 17 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.youtube.com/watch?v=H8QunGN1Itg", "http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA430637", "http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA430637" ] }
Can we get proper scientific articles (not sensationalist news stories) that talk about NOAA's "mystery sounds", like Upsweep, Bloop, etc.? The best I could find were NewScientist articles, but those were pretty shallow. (No pun intended.)
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2o2r3q
At what point do we call a data set Qualitative?
In highschool, we're taught the quantitative means numbers, qualitative means describable quities. Well, given the appropriate equipment I can't think of any "qualitative" data set that wouldn't be able to be represented as a quantitative data set. A good example is color. We typically call something "red" or "blue" but we can (more accurately) describe something as 635nm or 445nm.
askscience
{ "a_id": [ "cmj6o5x", "cmjahpk", "cmjthvu" ], "text": [ "A good example of a truly qualitative data set is one that uses focus groups or semi-structured interviews with participants. These are sometimes used in the social sciences. They are typically used to explore an issue beginning from a participants point of view. So instead of the researcher making assumptions about why a phenom might happen, listing those reasons, and asking the participant which of those reasons applies to him/her, the participant just tells the researcher and the researcher pulls apart what participants say later.\n\nFor example, in [this](_URL_0_) article, they interview 40 homeless youth with a series of open-ended questions pertaining to maltreatment, parental substance use, criminal activity, and prior living situations. They record the interviews, transcribe them, and code for instances of abuse, living transitions, and groupings by theme. Then they just report what they find using excerpts from interviews as examples. It's not meant to be really rigorous science in the way that large-scale, quantitative studies are, but it's meant to figure out what's happening straight from the source, without imposing any preconceived notions on that source.\n\nIn essence, yes, the qual data in this case is turned into numbers (e.g., every time a participant describes emotional abuse, it is coded numerically), but the numeric codes still represent qual data, so it is all still considered qualitative.", "Your example of color is spot on, but it fails to demonstrate why qualitative data might be preferable to quantitative for certain research questions. \n\nWhat most of what people call \"qualitative\" differences are really differences that come about because of vast complexity. Groups of people form based on differences in so many *quantitative* variables that it becomes impossible to model. Instead of trying to solve the [computationally intractable](_URL_1_) problem of identifying and measuring all of these variables, it becomes more productive to just refer to them as entirely unique groups. \n\nEDIT: Couple things to add:\n\nA lot of the time researchers will discover what some of the important quantitative variables are between groups by interviewing members and just listening to their responses. Early sex research was done this way and I wouldn't be surprised if most quantitative variables were first defined based on intuitions that researchers had through these kind of interviews.", "Color is actually less quantitative than you may think due to the way your eye works. Consider: you can achieve \"yellow\" either by using something like 440 nm sodium light, or by mixing green and red in appropriate quantities. \n\nWhich one is \"true\" yellow? Your eye cannot necessarily distinguish it because you only have cones for red and green, but no specific receptor for yellow. Sure, we have spectrometers that can do this, but color is actually a subjective qualitative measure, not a faithful representation of the spectrum. What actually goes on in your brain to create the colors in the world is still a bit of a mystery and it's in no way guaranteed that what you call \"red\" and what I call \"red\" are the same thing.\n\nThis can be most-easily understood for people who have some sort of visual impairment, for example inability to distinguish red and green. They obviously must have a different perception of color. Did you ever try to describe to someone what \"red\" looks like who can't see it?" ], "score": [ 3, 3, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://jiv.sagepub.com/content/21/10/1385.full.pdf+html", "http://en.wikipedia.org/wiki/Computational_complexity_theory#Intractability" ] }
At what point do we call a data set Qualitative? In highschool, we're taught the quantitative means numbers, qualitative means describable quities. Well, given the appropriate equipment I can't think of any "qualitative" data set that wouldn't be able to be represented as a quantitative data set. A good example is color. We typically call something "red" or "blue" but we can (more accurately) describe something as 635nm or 445nm.
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45yikf
What are inductors? How do they work? Why do we use them?
askscience
{ "a_id": [ "d01eb6v" ], "text": [ "It's a little hard to answer because I don't know how much you know about electricity and electronics, but we're going to start from the basics.\n\nFirst thing is, you need to understand the concepts of voltage and current. In order to understand them, we're going to use the fluid analogy. Imagine a circuit of tubes, filled with water, and a pump driving the water around and around. The pump provides pressure, which drives a flow of liquid against the resistance of the the pipes. This is equivalent to a voltage source, providing voltage, to drive current against a resistance. Big voltages make more current flow against the same resistance. Or a bigger resistance makes less current flow at the same voltage. This gives rise to Ohm's law V = I/R: Voltage = Current/Resistance.\n\nWe can continue to extend our analog. Inductors are like a water wheel in our flow. If we initially have our pump stopped, and turn it on, all the pressure will build up behind the water wheel, which will eventually starting to get it turning. Once the water wheel is turning at the speed that the current would flow if the water wheel wasn't there, then the water wheel provides no resistance at all. Moreover, if we try to stop or pump suddenly, the water wheel will keep spinning (because of its inertia), and try to force water through our tubes, making a massive pressure in the pipe (because the pump is off). This is what inductors do. When you turn the voltage on and try to drive current through them, the provide a lot of resistance, but once the current is flowing through them, the provide very little resistance. But if you try to stop the current flowing suddenly, they can make massive voltages to attempt to keep the current flowing.\n\nHow do inductors do this? By producing and storing magnetic fields. All conductors produce a magnetic field when current flows down them. Similarly, a *changing* magnetic field around a conductor produces current. Inductors are coils of wire designed to take advantage of these facts. Being made as a coil of wire, each wire's magnetic field interacts with every other wire. When you try to start pushing current through, the magnetic fields starts to grow, and it tries to push current in the other direction, which makes it hard to start the current through the inductor. However, once the current is stable, the magnetic field no longer changes, and hence it no longer tries to induce current in the opposite direction. When you try to stop current flow instantly, the large magnetic field is there and it starts to collapse (change), which then tries to drive the current through the inductor. Note, the magnetic field is growing to begin with, which induces a current opposing the current flow, the magnetic field is collapsing at the end, which produces current in the direction that it was being driven in the first place.\n\nAnd Why do we use them? 1) Because you can see they behave differently when the current is constant (no resistance, i.e. the spinning water wheel, no changing magnetic field) to when the current is changing (changing magnetic field produces opposing currents), they are used in filters. i.e. currents behaving at certain frequencies can be gotten rid of by inductors. 2) Changing voltages. The ability for inductors to make big voltages when you try to turn them off rapidly is used to make simple voltage converters. You put a low voltage into an inductor, switch it off, then store the large voltage spike you get, and use a diode to stop it leaking away. This voltage converter is called a boost converter, and it is very common. 3) Inductors turn up by accident. Basically all electromechanical devices, motors, solenoids, relays behave as inductors because they have coils of wire. Transformers also behave as inductors (though it's less by accident there). So electrical engineers need to know how inductors behave because they can produce nasty effects if you don't think about it (that effect where if you try to stop the current going through an inductor and it produces big voltages is very real, and will damage things if you don't protect the circuit against it).\n\nSo, to sum up. Inductors are circuit elements that are hard to get current to flow through initially, but try to keep the current flowing there after. They work by creating a magnetic field, which stores the energy and tries to induce currents. We use them as filters and voltage producers and they also turn up by accident." ], "score": [ 4 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
What are inductors? How do they work? Why do we use them?
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93xmbh
Why do humans often mess up on simple counting?
It seems odd that in many stressful and non-stressful environments humans often lose count of something so basic; say they’re counting coins they may have to start over again a couple of times because they keep losing count. It’s mainly weird to me, because it’s so simple.
askscience
{ "a_id": [ "e3guej9", "e3h7mr7" ], "text": [ "Put simply, people have three \"types\" of memory: long-term memory, short-term memory, and working memory. Long term is obviously stuff that's in there for good: Events and whatnot from your past. Short-term memory is similar but decays a lot quicker: what you had for dinner last night, for example. Then you have working memory, which is what will come into play here. It's like super short-term memory: Stop thinking about it for even a few seconds, and you might lose it. When you count, you're constantly replacing whatever number you're at in the series with the new one (24 is replaced by 25, 25 by 26, etc.).\n\nIf you get distracted, because you're sending so many numbers in and out of your working memory, it's very easy for your brain to forget which one you were last at. This gets even harder when you're dealing with something like coins, where there is the addition of spatial information that your brain needs to keep track of. That's why it's often easier to separate the coins as you count them or follow some sort of pattern, rather than just randomly counting each one.\n\nA good way to stop this from happening is to put the things you're counting into groups of 5s or 10s, which many people do naturally anyways. That way if you lose track, the re-count up to the point you're at will go much faster.\n\nHope that helps, let me know if you have any more questions! Also if anyone wants to add/modify anything to this, be my guess. It's been a while since I studied this stuff. \n\n\nEdit: Took out a silly repetitive sentence.", "It is interesting watching a toddler learn to count things like coins on a table. \nThey not only have to learn the number sequence (1,2,3,4 etc.) they have to learn to not count the same thing twice. You have to go over the items in a systematic way so as to not cover the same ground more than once. That is, actually, a bigger skill than just 1,2,3,4." ], "score": [ 26, 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Why do humans often mess up on simple counting? It seems odd that in many stressful and non-stressful environments humans often lose count of something so basic; say they’re counting coins they may have to start over again a couple of times because they keep losing count. It’s mainly weird to me, because it’s so simple.
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33bw1z
How does one determine the downstream targets of a biochemical pathway?
As title described, how does one experimentally determine what the downstream targets of a pathway? For example, in the classic Ras pathway of Ras-GTP - > Raf - > Mek - > Erk, how did people discover that Ras-GTP interacted with Raf before they knew the existence of Raf? If there is a biochemical pathway A - > B - > - > E and I suspected that between B and E there were some other unknown intermediary targets, how would I figure out what they were? Knock outs and inhibitors can show me that B is downstream of A but how would I know if C and D existed?
askscience
{ "a_id": [ "cqkuzi3" ], "text": [ "You'd have to do some sort of screen. Induce a whole bunch of random mutations and then look for mutants that are able to make B but not E. You'd then have to do further work to prove where the mutant fits into the pathway." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
How does one determine the downstream targets of a biochemical pathway? As title described, how does one experimentally determine what the downstream targets of a pathway? For example, in the classic Ras pathway of Ras-GTP - > Raf - > Mek - > Erk, how did people discover that Ras-GTP interacted with Raf before they knew the existence of Raf? If there is a biochemical pathway A - > B - > - > E and I suspected that between B and E there were some other unknown intermediary targets, how would I figure out what they were? Knock outs and inhibitors can show me that B is downstream of A but how would I know if C and D existed?
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49jtky
Is there any evidence to support exercise helping to cure an existing minor bacterial or viral infection?
Can you "sweat out" a cold, or the flu? Is the immune system positively or negativly influenced by excercise while sick?
askscience
{ "a_id": [ "d0sowm4", "d0sjstg" ], "text": [ "The immune system is depressed during exercise, since the body needs resources to deal with other things (namely, the metabolic and physical stress of exercise). Light to moderate exercise, which raises your cardiac output with minimal stress, can help circulate immune cells to the infected regions, but the effects are minimal.\n\nPeople who are fit tend to have stronger immune systems, which leads to a shorter recovery time, but exercising while sick doesn't improve your condition (and may worsen it). It is important to note that during periods of intense exercise, the immune system may remain depressed until the athlete is fully recovered from their training (which is why constant infections are a symptom of overtraining).", "The evidence is [not very clear](_URL_0_) about whether or not excercise *prevents* the common cold.\n\nI'm having trouble finding information about the specific effects of excercise on *treating* the common cold. [This large review](_URL_1_) of various methods to prevent and treat colds doesn't cover it. However, overtraining and exertion can have [negative effects on the immune system](_URL_2_)." ], "score": [ 27, 6 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.ncbi.nlm.nih.gov/pubmed/24921030", "http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3928210/", "http://acta.tums.ac.ir/index.php/acta/article/view/4353/4467" ] }
Is there any evidence to support exercise helping to cure an existing minor bacterial or viral infection? Can you "sweat out" a cold, or the flu? Is the immune system positively or negativly influenced by excercise while sick?
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ls3mr
Why does self preservation take a backseat when it comes to things people enjoy?
i.e. Why do people not care about safety when doing something they like? Examples may be: dangerous sex, riding a roller coaster, chainsaw juggling, etc. EDIT: I meant dangerous sexy times.
askscience
{ "a_id": [ "c2v5dhk", "c2v71tp" ], "text": [ "Sex **is** self preservation, indeed it's the only lasting form.", "Might want to ask this over in r/asksocialscience" ], "score": [ 5, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Why does self preservation take a backseat when it comes to things people enjoy? i.e. Why do people not care about safety when doing something they like? Examples may be: dangerous sex, riding a roller coaster, chainsaw juggling, etc. EDIT: I meant dangerous sexy times.
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1k59fw
How are sellers of Cord Blood getting their hands on it?
My wife works at a medical supplier and she told me that Pall Medical sells cord blood. She said it goes for ~$2000 an order. Uh. I only know of one source for this substance so... How are companies that are making a profit off this substance getting it?
askscience
{ "a_id": [ "cbli7c1" ], "text": [ "> There are several methods for collecting cord blood. The method most commonly used in clinical practice is the \"closed technique\", which is similar to standard blood collection techniques. With this method, the technician [cannulates](_URL_2_ \"A cannula (from Latin \"little reed\"; plural cannulae\\) or canula is a tube that can be inserted into the body, often for the delivery or removal of fluid or for the gathering of data. In simple terms, a cannula can surround the inner or outer surfaces of a trocar needle thus extending needle approach to a vein by half or more of the length of the introducer.\") the vein of the severed umbilical cord using a needle that is connected to a blood bag, and cord blood flows through the needle into the bag. On average, the closed technique enables collection of about 75 ml of cord blood. \n > \n > Collected cord blood is [cryopreserved](_URL_1_ \"Cryopreservation (or cryoconservation\\) is a process where cells, whole tissues, or any other substances susceptible to damage caused by chemical reactivity or time are preserved by cooling to sub-zero temperatures. At low enough temperatures, any enzymatic or chemical activity which might cause damage to the material in question is effectively stopped.\") and then stored in a cord blood bank for future transplantation. A cord blood bank may be private (i.e. the blood is stored for and the costs paid by donor families) or public (i.e. stored and made available for use by unrelated donors). While public cord blood banking is widely supported, private cord banking is controversial in both the medical and parenting community. Although umbilical cord blood is well-recognized to be useful for treating hematopoietic and genetic disorders, some controversy surrounds the collection and storage of umbilical cord blood by private banks for the baby's use. Only a small percentage of babies (estimated at between 1 in 1,000 to 1 in 200,000) ever use the umbilical cord blood that is stored. The American Academy of Pediatrics 2007 Policy Statement on Cord Blood Banking states that: \n > \n > \"Physicians should be aware of the unsubstantiated claims of private cord blood banks made to future parents that promise to insure infants or family members against serious illnesses in the future by use of the stem cells contained in cord blood.\" \n > \n > Cord blood is stored by both public and private cord blood banks. Public cord blood banks store cord blood for the benefit of the general public, and most U.S. banks coordinate matching cord blood to patients through the National Marrow Donor Program (NMDP). Private cord blood banks are usually for-profit organizations that store cord blood for the exclusive use of the donor or donor's relatives. \n > \n > Public cord blood banking is supported by the medical community. However, private cord blood banking is generally not recommended unless there is a family history of specific genetic diseases. \n > \n > New parents have the option of storing their newborn's cord blood at a private cord blood bank or donating it to a public cord blood bank. The cost of private cord blood banking is approximately $2000 for collection and approximately $125 per year for storage, as of 2007. Donation to a public cord blood bank is not possible everywhere, but availability is increasing. Several local cord blood banks across the United States are now accepting donations from within their own states. The cord blood bank will not charge the donor for the donation; the OB/GYN may still charge a collection fee, although many OB/GYNs choose to donate their time. \n > \n > After the first sibling-donor cord blood transplant was performed in 1988, the National Institute of Health (NIH) awarded a grant to Dr. Pablo Rubinstein to develop the world's first cord blood program at the New York Blood Center (NYBC), in order to establish the inventory of non embryonal stem cell units necessary to provide unrelated, matched grafts for patients. \n > \n > In 2005, University of Toronto researcher Peter Zandstra developed a method to increase the yield of cord blood stem cells to enable their use in treating adults as well as children. \n \nFrom [wiki](_URL_0_). Just quick google ;)" ], "score": [ 7 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Cord_blood#Cord_blood_harvesting", "http://en.wikipedia.org/wiki/Cryopreservation", "http://en.wikipedia.org/wiki/Cannula" ] }
How are sellers of Cord Blood getting their hands on it? My wife works at a medical supplier and she told me that Pall Medical sells cord blood. She said it goes for ~$2000 an order. Uh. I only know of one source for this substance so... How are companies that are making a profit off this substance getting it?
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20wzr1
What do omega-3 DHA, EPA, ALA do for our brains? Do they act as components of certain brain cells?
askscience
{ "a_id": [ "cg7nncv", "cgavuvz" ], "text": [ "All cells require fatty acids to modulate membrane structures for a variety of cellular processes, namely, endocytosis. Neurons are particularly susceptible to perturbation in these processes, because of their extreme morphology, and while the exact mechanism is unknown, it is presumed that supplementing with essential fatty acids prevents shortages or abnormalities in fatty acid synthesis, and allows cells to function normally.", "So DHA, EPA and ALA are all essential fatty acids, meaning they are nutrients that we need to obtain from our diet because we don't have the appropriate enzymes to make them. Fatty acids are crucial to our bodies because the membranes that envelope all cells are made up of these fatty acids linked together into lipid molecules of all different kinds. DHA, in particular, has been reported to make up as much as 50% of the membrane around a neuron is made up of DHA! That membrane is constantly being turned over as the cell changes and repairs itself. The consumption of essential fatty acids is critical during development, but still important after maturity. However, this proportion can vary if your diet lacks essential fatty acids.\n\nFatty acids, besides making up the membrane that holds neurons together, also is important for signaling (lipid rafts, as mentioned before) and is used to make endogenous neurotransmitters that activate the cannabinoid receptors.\n\nOne report I found says that serotonergic and catecholaminergic (dopamine, norepinephrine) cells may be particularly affected by a lack of the essential fatty acids in neurons. This citation is the second one linked below.\n\ncitations: _URL_0_\n\n_URL_1_\n\n*edit for clarity and accuracy" ], "score": [ 4, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://medind.nic.in/icb/t05/i3/icbt05i3p239.pdf", "http://europepmc.org/abstract/MED/12728744/reload=0;jsessionid=NNPY1gSOglPgnfVCpo7w.12" ] }
What do omega-3 DHA, EPA, ALA do for our brains? Do they act as components of certain brain cells?
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b03m0m
What is the science behind getting hit in the head and low testosterone?
I was reading a post on r/boxing how getting hit in the head damages the pituitary gland, and causes low testosterone, yet it's a slow, steady process. What does this mean? Every hit chips some of your testosterone? Or perhaps repeated, long term hits damage your testosterone? I've had a few concussions and I think my T is fine.. any input appreciated
askscience
{ "a_id": [ "eidobtr" ], "text": [ "Oh this is a fun question. \n\nSo the pituitary gland is this tiny lobule in your brain. It produces hormones that stimulate different glands in your body through feedback loops. \n\nNow the hormone I want to specifically focus is LH. It is produced in the pituitary and released into the bloodstream. This hormone then travels through blood and stimulates the Leydig cells in your testicles which in turn produce testosterone. \n\nWhen you damage the pituitary gland (concussion that cuts off the blood supply to the pituitary) it can't produce the LH hormone to stimulate the testicles to produce testosterone. It would be like cutting off communication between the boss and his workers. So even though the workers are fully capable to produce testosterone, they are not getting the go ahead from the boss. \n\nI hope this makes sense." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
What is the science behind getting hit in the head and low testosterone? I was reading a post on r/boxing how getting hit in the head damages the pituitary gland, and causes low testosterone, yet it's a slow, steady process. What does this mean? Every hit chips some of your testosterone? Or perhaps repeated, long term hits damage your testosterone? I've had a few concussions and I think my T is fine.. any input appreciated
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Is the entire human body "full"?
I was curious as to whether the entire human body is "full." What I mean by this is that are there empty spaces in our body? Is the entire internal area or volume of our bodies full? For example: Lets say that there are two organs, and they are a distance apart from each other. Is there nothing between them, or is it full with fats, muscle, etc. Is 100% of our internal space of our body filled? Are there "open spaces" anywhere in our body? I'm just really curious and would appreciate an answer!
askscience
{ "a_id": [ "cewkcv7" ], "text": [ "There should be no free air in any body cavity - this could indicate either a pneumothorax in the chest or a ruptured/perforated visceral organ in the abdomen. There are no otherwise 'empty' spaces because that would imply a vacuum, which the body would not support (the walls would just collapse together to annihilate the space). Even free fluid is rare (though sometimes physiologic).\n\nFor background, remember that humans are [coelomates](_URL_3_), which means that the general body plan is that of two concentric tubes (think a stretched out donut). The [donut hole is our gut](_URL_2_), and is considered 'exterior' to the body itself. Most of your viscera are in the body cavity (coelom), though some lie in the body wall itself (eg the kidneys, which are [retroperitoneal](_URL_4_)). If you look at [images of the abdomen](_URL_6_) or [chest](_URL_7_), you'll see that the cavities are filled with organs and their supporting structures (lots of [connective tissue](_URL_0_)). The organs are typically separated from the body wall by [pleura](_URL_5_) in the case of the lungs and [peritoneum](_URL_1_) for the abdominal organs. Any remaining space in the abdomen is taken up by soft tissues like fat or muscle." ], "score": [ 17 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Connective_tissue", "http://en.wikipedia.org/wiki/Peritoneum", "http://biology.kenyon.edu/courses/biol112/Biol112WebPage/Syllabus/Topics/Week%207/Resources/coelom.GIF", "http://en.wikipedia.org/wiki/Coelom", "http://en.wikipedia.org/wiki/Retroperitoneal_space", "http://en.wikipedia.org/wiki/Pleura", "http://www.radiologyinfo.org/photocat/popup/abdo-ct-norm.jpg", "http://medicalcityhospital.com/services/imaging/images/ct-chest.jpg" ] }
Is the entire human body "full"? I was curious as to whether the entire human body is "full." What I mean by this is that are there empty spaces in our body? Is the entire internal area or volume of our bodies full? For example: Lets say that there are two organs, and they are a distance apart from each other. Is there nothing between them, or is it full with fats, muscle, etc. Is 100% of our internal space of our body filled? Are there "open spaces" anywhere in our body? I'm just really curious and would appreciate an answer!
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1a1itq
How much water is absorbed on the way down?
If I drink a cup of water, how much will end up in a pool at the bottom of my stomach? Further, how long will it take for the rest of that cup to absorb into the body?
askscience
{ "a_id": [ "c8tbak2" ], "text": [ "Water is absorbed, filtered and reabsorbed through several organs and membranes controlled by neural and hormonal influence. Water is absorbed throughout your lower GI tract as well as in your kidneys. \nThe amount of water that is retained is regulated by a set point osmolarity. An increase in osmolarity will initiate a response to make sure that adequate water is absorbed by the intestines and kidneys and vice versa expelled when osmolarity decreases.\n\nThe food is propelled down into the duodenum through a tight pyloric sphincter that allows proper sectioning of the GI. Assuming that your stomach is empty when you start drinking the glass of water, it would pass rather quickly through your digestive tract due to its liquid form.\n\nThe answer you are looking for is a bit too complex with a lot of factors to take into consideration, since the metabolic state of the person would contribute largely to the amount of water you retain and excrete." ], "score": [ 7 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
How much water is absorbed on the way down? If I drink a cup of water, how much will end up in a pool at the bottom of my stomach? Further, how long will it take for the rest of that cup to absorb into the body?
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9wvwdk
Is it cheaper to build up or down? Why?
askscience
{ "a_id": [ "e9qvfwc" ], "text": [ "Definetely up.\n\nIf you build a certain height / deepth, the height difference relative to the ground will remain the same in either direction. \n\nIf you build upwards, the stability of your construction itself is your biggest problem. If it's stable enough, you could theoretically just add more materials on top and build higher without any obstacles.\n\n\nBuilding downwards requires the previous removal of lots of materials like earth and rocks which gets more expensive the deeper it gets. I'd expect that a proper drill for this would be much more expensive that a crane for builing upwards. Afterwards you'd have to deal with stabilizing that hole, keeping it dry from ground water and floodings and proper ventilation of it. You can't just open a window down there.\n\n\nNot to mention the cost of workers willing to work underground." ], "score": [ 4 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Is it cheaper to build up or down? Why?
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1ri6wl
Please help settle a workplace feud regarding space heaters and fans.
A guy I work with keeps telling me that putting a fan behind a space heater will make the room heat up slower. I argued that the same amount of heat is being produced by the heater, and in addition, the fan's motor would produce even more heat, and possibly even friction from the blades. I said it would just disperse the heat in the room rather than letting it pool up in one area. Can anyone here settle this?
askscience
{ "a_id": [ "cdnilrg", "cdni8d1", "cdnjfua", "cdnj58v" ], "text": [ "Putting a fan behind the space heater will produce forced convection, which will cool down the heater and heat up the room as a whole. This is the reason central furnaces have fans in the first place: it spreads the heat around (same for AC, but the reverse principle: you heat up the condenser and cool down the air).\n\nWhat the net effect over a long period of time will be (i.e. if the room will end up warmer with or without the fan) depends on many factors, but generally I would venture that the room will be warmer overall with the fan than without. But short term, in a cold room, the fan will certainly speed up the process.", "It depends on the definition of \"heat up the room\". Do you want evenly districubuted heat or warmer area around the heater? How warm do you want the room to be? How big is the room? How well isolated it is? What temperature is outside?\n\nIf the room will be too big and/or badly isolated and/or it is very cold outside and/or your desired temperature is too high the fan might be contraproductive.", "You are correct that the result will be at least as much heat energy into the room, and more air movement (to a point) will result in more even heat. This may be better, or not. If the room is not sealed for instance, the door is open to the rest of the building) more heat may escape than if you had a warm side of the room away from the door. And as OlejzMaku implied, if the room is too large or cold, the space heater may be unable to make the whole thing comfortable but could heat one corner. \nAlso, note that moving air may feel cooler than still air of the same temperature. \nIt sounds like you are trying to heat the whole room. If so, the whole room will heat more evenly with better circulation, and this means the guy sitting next to the heater will not get warm as quickly. If I had brought the heater, I might prefer no fan.", "More information is needed as well as the previous responses. Is the room a defined sealed space? If not you will be attempting to heat fresh air instead of re-heated air as it circulates within the space. The friction of the blades on the air does not impact the heat. The speed in which the drag coefficient of the air on the blades versus the cooling affect of the ambient air, would need to be astronomically fast." ], "score": [ 11, 5, 3, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Please help settle a workplace feud regarding space heaters and fans. A guy I work with keeps telling me that putting a fan behind a space heater will make the room heat up slower. I argued that the same amount of heat is being produced by the heater, and in addition, the fan's motor would produce even more heat, and possibly even friction from the blades. I said it would just disperse the heat in the room rather than letting it pool up in one area. Can anyone here settle this?
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263kx5
In a synapse, how does the axon terminal stay put relative to the post-synaptic cell if the two aren't touching? What is holding it in place?
In all the depictions of synapses I've found, the axon terminal floats above the post-synaptic cell, with no contact between the two. Is this actually the case? Or is there some structure of some kind holding them in place?
askscience
{ "a_id": [ "chnbnh3", "chnc2zd" ], "text": [ "There are lots of other cells in the brain, as well as the ECM (extracellular matrix) which does add support. The other main cells of the brain are the astrocytes (main cells in support/holding neurons in place) oligodendrocytes (provide the myelin sheaths to multiple neurons) and also some specialized phagocytic type cells.\n/E \nastrocytes are also the main cells forming the blood brain barrier.", "In a sense, it's true, but neurons are held in place by the surrounding tissues. Neurotransmitters are chemicals which are released, float out into the synaptic cleft, and hang out there until a sufficient quantity is absorbed by the adjoining neuron, whereupon the remainder is reabsorbed by the axon terminal (because neurotransmitters are a fairly precious commodity). \n\nKeep in mind that tissues are dense with neurons, too. An axon in branched in such a way that it will come into contact usually with more than one dendrite branch." ], "score": [ 13, 4 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
In a synapse, how does the axon terminal stay put relative to the post-synaptic cell if the two aren't touching? What is holding it in place? In all the depictions of synapses I've found, the axon terminal floats above the post-synaptic cell, with no contact between the two. Is this actually the case? Or is there some structure of some kind holding them in place?
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4vn0w7
Walking through which liquid(s) is closest to walking through air?
A person wearing a sufficient suit, walking (or just moving their arms), fully submerged in a vat of which liquid would be most similar to a person walking in an empty vat? I'm pretty sure the factors of importance here are viscosity, temperature, density, and inertia...
askscience
{ "a_id": [ "d61bhcf", "d61bncz" ], "text": [ "The question doesn't really have enough context to make a lot of sense, but I'll take a stab:\n\nAcetone and ether have two of the lowest viscosities out of any liquids at room temperature, but they are still about 16 times more viscous than air. Being an order of magnitude off, the sensation of resistance moving through acetone wouldn't feel much like that of air. Water is three times more viscous than these liquids, so it's much more comparable to water.\n\nLiquid helium has a much lower viscosity, but at standard pressure, the temperature must be lower than 4K (-269°C, -452°F), at which point I'd say getting a human submerged would take a lot of protective equipment to keep from causing serious burns or death. Interestingly, below 2.17K, helium becomes a superfluid, which has an extremely low viscosity and will flow though apparently solid container walls. There are other interesting properties of superfluid liquid helium, like the fact that it climbs its container walls.\n\nFundamentally though, liquids don't have properties in the same range as air, and it requires manipulating variables beyond reasonable ranges just to get one parameter close. Density, for instance, doesn't get close to that of air while maintaining liquid state.", "What is an empty vat? how are we measuring the similarity? I would imagine a low-ish density liquid like liquid hydrogen at a very low pressure may be similar in the sense that it takes not too much energy to move around.\n\nBut to be honest, at very small velocities, any liquid is the same as air for the purpose of walking." ], "score": [ 3, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Walking through which liquid(s) is closest to walking through air? A person wearing a sufficient suit, walking (or just moving their arms), fully submerged in a vat of which liquid would be most similar to a person walking in an empty vat? I'm pretty sure the factors of importance here are viscosity, temperature, density, and inertia...
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1ruqet
How can I calculate the power output of a Fresnel reflector/Parabolic concentrator
I'm currently working on a project for my engineering degree and am struggling with calculating outputs for a solar oven. I mainly want to focus on viability within the UK and am unsure what to use as a Q value (for the amount of energy provided by the sun) within my Stefan-Boltzmann equation. I've seen the average proposed as 1kW of raw sunshine on the earth surface, however I've also seen that the distance from the equator means that this value is only 60% of that within the UK (600W). My main question is because this is diffuse light is this then negated because of the concentrating aspects of the reflectors or do I have to use 600W as my base value?
askscience
{ "a_id": [ "cdrb3wc" ], "text": [ "The amount of solar energy that you have to work with is going to be in the form of Watts per square meter - energy per area per time. The area in this case is the area of your reflectors - this is your maximum starting value. That energy is then concentrated into a smaller space ... but the amount of theoretically available energy isn't going to change." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
How can I calculate the power output of a Fresnel reflector/Parabolic concentrator I'm currently working on a project for my engineering degree and am struggling with calculating outputs for a solar oven. I mainly want to focus on viability within the UK and am unsure what to use as a Q value (for the amount of energy provided by the sun) within my Stefan-Boltzmann equation. I've seen the average proposed as 1kW of raw sunshine on the earth surface, however I've also seen that the distance from the equator means that this value is only 60% of that within the UK (600W). My main question is because this is diffuse light is this then negated because of the concentrating aspects of the reflectors or do I have to use 600W as my base value?
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wsnaj
What is the least complex life form that actively protects its offspring?
Just wondering what the simplest form of life is that is aware of its offspring and is takes care of it such a degree that it will fight other shit. For instance, alligators will stick around and respond to the cries of their kids. Are there any "less developed" species that do this, i.e., fish or insects?
askscience
{ "a_id": [ "c5g349c", "c5g6rb6" ], "text": [ "Ants.\n\nHoneybees.\n\n[Wolf spider. Warning: spider pic.](_URL_0_)\n\n[Mouthbrooding fish, various species.](_URL_2_)\n\n [Archey's frog.](_URL_1_)", "Well since you said \"aware\" and \"offpspring\" you're not going to get anything much simpler than an insect (although \"simple\" is a loaded word in evolutionary biology). I'm sure there are smaller animals than GrandmaGos listed that protect their young, but they would belong to an insect kingdom, and thus be equally complex. \n\nBelow an insectoid level of intelligence, life forms would lack what you would call \"awareness\", and you'll see fewer sexually reproducing lifeforms. I haven't been able to find a reference beyond the anecdotal to care for the young in anemones and jellyfish" ], "score": [ 5, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Wolf_spider", "http://en.wikipedia.org/wiki/Archey%27s_Frog", "http://en.wikipedia.org/wiki/Mouthbrooder" ] }
What is the least complex life form that actively protects its offspring? Just wondering what the simplest form of life is that is aware of its offspring and is takes care of it such a degree that it will fight other shit. For instance, alligators will stick around and respond to the cries of their kids. Are there any "less developed" species that do this, i.e., fish or insects?
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1fzu3d
Me and my sworn enemy are fighting and fall out of a window together, Hollywood style. Would using him to cushion my landing increase my chances of survival?
askscience
{ "a_id": [ "cafh9q1" ], "text": [ "It would absolutely help. While you'll both have the same [change in momentum](_URL_0_), the force you experience is going to be less because it will occur over a longer time period. A human body is going to be much more compressible than concrete or asphalt, assuming you're falling on something like that." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Impulse_\\(physics\\)" ] }
Me and my sworn enemy are fighting and fall out of a window together, Hollywood style. Would using him to cushion my landing increase my chances of survival?
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7ujksq
Do I gain anything plugging a 10 gauge exstention cable into a standard wall outlet for running my tools?
askscience
{ "a_id": [ "dtkwnx0" ], "text": [ "To clarify a bit, do you mean \"instead of a lighter extension cord\" or \"instead of just plugging the tool straight into the wall?\"\n\nThere will be less resistance loss compared to a lighter extension cord of the same length, so you'll save a little energy. A heavier extension cord will also let you use a longer length. But any extension cord at all will be worse than plugging straight into the wall." ], "score": [ 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Do I gain anything plugging a 10 gauge exstention cable into a standard wall outlet for running my tools?
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5ullew
The 4 fundamental forces of nature are well known, but how far can they be condensed?
Everybody was taught about the 4 fundamental forces of nature ( weak interaction, strong interaction, gravity, and electromagnetism), but lately the weak interaction and electromagnetism can be unified as the Electroweak Force, while the Strong interaction sometimes gets split into 'residual' vs 'fundamental'. Also, quintessence is mentioned in several theories.
askscience
{ "a_id": [ "ddvoprm" ], "text": [ "The residual strong force, or \"nuclear force\" is more of an indirect knockoff force, in much the same way [Van der Walls forces](_URL_0_) are a residual effect of electromagnetism.\n\n~~Electromagnetism and the Weak Interaction are separate at low energies, but at hot enough temperatures they are the same fundamental interaction.~~ (This was wrong, see huppaboo's reply to this post) It is through Electroweak theory that we were able to predict and ultimately discover the Z Boson; it also predicts the existance of the Higgs Boson, which we seem to have discovered (though it hasn't been totally confirmed just yet that what we found is indeed the Higgs).\n\nUnifying the Electroweak and Strong forces into a [Grand Unified Theory](_URL_1_) is still an area of active research, assuming they are indeed fundamentally the same force (they may not be!). Adding gravity to that mix is a step even further than that." ], "score": [ 4 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "https://en.wikipedia.org/wiki/Van_der_Waals_force", "https://en.wikipedia.org/wiki/Grand_Unified_Theory" ] }
The 4 fundamental forces of nature are well known, but how far can they be condensed? Everybody was taught about the 4 fundamental forces of nature ( weak interaction, strong interaction, gravity, and electromagnetism), but lately the weak interaction and electromagnetism can be unified as the Electroweak Force, while the Strong interaction sometimes gets split into 'residual' vs 'fundamental'. Also, quintessence is mentioned in several theories.
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1f8jct
Viewing history with FTL travel
askscience
{ "a_id": [ "ca7wyjm", "ca807og", "ca7tf0z" ], "text": [ "No, there is a fundamental limit on the resolution of any telescope and it is well above the resolution needed to view something with such a small angular area.", "If you can travel faster than light, then you can do something simpler than pointing a super telescope at Earth from very far away. Instead you can use your FTL to just travel back in time on Earth and see the history happen right around you. FTL is equal to timetravel, a good explanation of this is [here](_URL_0_). In the article they use instantaneous communication just because the graphs are easier to draw for instantaneous but it works the same for anything faster than light.", "Yes, if you had a good enough telescope." ], "score": [ 3, 2, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.theculture.org/rich/sharpblue/archives/000089.html" ] }
Viewing history with FTL travel
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wwkqa
What is the significance of the 565 gigaton CO2 threshold?
This [article](_URL_0_) says that "humans can pour roughly 565 more gigatons of carbon dioxide into the atmosphere by midcentury and still have some reasonable hope of staying below two degrees" and "we'll blow through our 565-gigaton allowance in 16 years." Does this mean that we have just 16 years of precious civilization remaining before climate change becomes unmanageable?
askscience
{ "a_id": [ "c5h2p8u" ], "text": [ "I only want to point out that civilization won't necessarily collapse because of climate change. It'll drastically alter our environment, and probably (although not definitely) result in lots of famine, disease (because of refugees), resource wars, etc.\n\nBut that won't necessarily be the end of civilization any more than world wars one and two were." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [ "http://www.rollingstone.com/politics/news/global-warmings-terrifying-new-math-20120719?page=2" ] }
{ "url": [] }
What is the significance of the 565 gigaton CO2 threshold? This [article](_URL_0_) says that "humans can pour roughly 565 more gigatons of carbon dioxide into the atmosphere by midcentury and still have some reasonable hope of staying below two degrees" and "we'll blow through our 565-gigaton allowance in 16 years." Does this mean that we have just 16 years of precious civilization remaining before climate change becomes unmanageable?
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1rcvso
Why does it matter to have both Big and Little Endian?
Wouldn't it be easier if everyone agreed on using one over the other? Or are their cases where byte significance matters?
askscience
{ "a_id": [ "cdm27j3" ], "text": [ "The original computer architectures used different circuitry for retrieving bytes assembling into word sizes matching the register size in the CPU. When you were looking at the memory sequentially, independent from the CPU, you needed to know which way the CPU assembled the data into register values to understand why your calculations where coming out wrong" ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Why does it matter to have both Big and Little Endian? Wouldn't it be easier if everyone agreed on using one over the other? Or are their cases where byte significance matters?
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33bwqu
Size limitations of medieval engineering?
I am interested in the physical restrictions that would apply to a medieval stone tower (perhaps limiting the height to which it could be constructed). The research that I have done to-date has raised certain questions that I do not possess the mathematical ability to resolve. [The Philadelphia City Hall](_URL_0_) is the world's tallest masonry building (548 ft. tall), has walls 22 ft. thick at the base to bear the weight of the stone. Yet, a tower with parallel brick or stone walls could supposedly be built to a height of 1.3 miles before the foundation was crushed under its own weight (according to J.E. Gordon in his book *Structures* *Or* *Why* *Things* *Don't* *Fall* *Down* [Pelican, 1978-84]; for the record, he was engaging a thought experiment regarding the possible height to which the Tower of Babel could be constructed). With this example in mind, and considering that the tallest medieval structure in Britain is the [Salisbury Cathedral](_URL_1_) would it be possible to have a medieval equivalent of the [University of Pittsburgh's Cathedral of Learning](_URL_2_), which is of approximately the same height (535 ft.)? I am, again, only asking about the physical limitations. I realize that the practical applications of, say, hauling water to the 15th floor are patently ridiculous. Human comfort is of no consequence to this, it's merely a structural question.
askscience
{ "a_id": [ "cqjge6c", "cqjlhbh" ], "text": [ "From a technical perspective, there is a theoretical maximum height for every material, based on its compressive strength, be it bricks, glass, steel, whatever (Assuming a single column). I would think that just because the theoretical height is X, you could go significantly higher based on the design you use. \n\nAlso, depending on the structure, it may not matter if the material exceeds the compressive strength. (for example, think about a mountain). Provided the base is wide enough, you could keep staking things up, even when the lower foundations begin to crumble. The only time this would be an issue, if you wanted to start putting rooms in the structure. If your making a wall, or a tower, you don't necessarily have to go up them from the inside.", "I imagine it would mostly depend on the ratio of living space to total space. That is, if the tower is solid or it has rooms inside.\n\nA solid parallel tower would be governed by the 1.3 mile limit.\n\nYou could go higher than this with a solid tower. Build the base as a pyramid. Then, build a thin solid tower on top. The lowest bricks in the thin solid tower are at their maximum compressive stress. Those just underneath carry slightly more load but there are more bricks, and they are under their maximum compressive stress. Thus tapering allows you to exceed the 1.3 mile limit. Perhaps the most efficient taper is a straight taper from base to a point at the top, essentially just a pyramid. Perhaps not. It's not too difficult a problem to solve analytically with some calculus. It might also be that if you employ a pyramid shape, that there is no maximum height. Frankly, I don't care to crunch the numbers.\n\nIf you have rooms, you may encounter different limitations. I think for a large enough tower you can estimate mean stresses as just described for a solid tower, depending on the overall shape. On a smaller scale, you get stress concentrations, although with careful design these should be almost eliminated (very large smooth curves in arches, for example). Your weakest section will probably be a very low point on the tower, where the cross-sectional area is low (such as halfway up a room with doors and windows in the walls). These stones must support not only all the stones directly above them, but also those used in ceilings, for example. A parallel tower would have a height limit of less than 1.3 miles in this case. Of course I assumed the rooms start from the bottom in a parallel tower. If you have rooms only near the top of the tower you effectively have a tapering of mass again, and you increase this limit.\n\nTL;DR:\n\nSolid parallel tower: 1.3 miles\n\nSolid pyramid: More than 1.3 miles. \n\nParallel tower with rooms from the base: Less than 1.3 miles.\n\nTapering of the mass (whether by change of tower shape or having large rooms at the top) increases the height, generally. Doing the reverse, such as taking out blocks near the bottom for rooms, reduces the height." ], "score": [ 5, 2 ] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Philadelphia_City_Hall", "http://en.wikipedia.org/wiki/Salisbury_Cathedral", "http://en.wikipedia.org/wiki/Cathedral_of_Learning" ] }
{ "url": [] }
Size limitations of medieval engineering? I am interested in the physical restrictions that would apply to a medieval stone tower (perhaps limiting the height to which it could be constructed). The research that I have done to-date has raised certain questions that I do not possess the mathematical ability to resolve. [The Philadelphia City Hall](_URL_0_) is the world's tallest masonry building (548 ft. tall), has walls 22 ft. thick at the base to bear the weight of the stone. Yet, a tower with parallel brick or stone walls could supposedly be built to a height of 1.3 miles before the foundation was crushed under its own weight (according to J.E. Gordon in his book *Structures* *Or* *Why* *Things* *Don't* *Fall* *Down* [Pelican, 1978-84]; for the record, he was engaging a thought experiment regarding the possible height to which the Tower of Babel could be constructed). With this example in mind, and considering that the tallest medieval structure in Britain is the [Salisbury Cathedral](_URL_1_) would it be possible to have a medieval equivalent of the [University of Pittsburgh's Cathedral of Learning](_URL_2_), which is of approximately the same height (535 ft.)? I am, again, only asking about the physical limitations. I realize that the practical applications of, say, hauling water to the 15th floor are patently ridiculous. Human comfort is of no consequence to this, it's merely a structural question.
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s8kb4
since our anus doesn't self lubricate, why doesn't pooping rip it?
I know poo generally isn't super hard, rigid, or pointy. But it is coming out of somewhere that has to stretch to allow its passage. So, why doesn't it cause tearing?
askscience
{ "a_id": [ "c4byrzh" ], "text": [ "The entire GI tract from mouth to anus has a mucus membrane which aside from containing bicarbonate and electrolytes acts as a natural lubricant. Large amounts of mucus are present in the SI and colon to protect the epithelial cells and allow lubrication for food excretion. If you want to test this eat a fiber bar after consuming a diet low in fiber and you will actually see an opaque mucus in the toilet." ], "score": [ 11 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
since our anus doesn't self lubricate, why doesn't pooping rip it? I know poo generally isn't super hard, rigid, or pointy. But it is coming out of somewhere that has to stretch to allow its passage. So, why doesn't it cause tearing?
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in2z8
What kind of wizardry are my Otter Pops doing?
My otter pops did not freeze in the freezer after two days of being in. When I take them out, and hit them on the counter, they magically do an instant freeze! Almost cartoon-like. Whattheheckisgoingon? More specifically, 1) Why didn't they freeze in the first place? and 2) Why does the banging make them freeze?
askscience
{ "a_id": [ "c252igi", "c253u7l" ], "text": [ "It's called [supercooling](_URL_0_). I am not an expert, but I'll try to do it justice. Essentially, just because you cool something, it may not freeze. In this case, freezing will happen if there's a nucleation site or a variation in pressure allowing the molecules to form into the crystal structure.", "Ice crystals do not form just because the water is below a certain temperature. Like all crystals, they need a nucleation point that induces the clustering required for seed crystals. If your freezer is very still, and the liquid inside a clean container, and if the liquid doesn't have any particular matter, it can very plausibly not have any good nucleation points, allowing it to get colder than freezing without freezing solid. When you bang it, you create nucleation points, and the crystals form very rapidly due to their coldness." ], "score": [ 17, 6 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Supercooling" ] }
What kind of wizardry are my Otter Pops doing? My otter pops did not freeze in the freezer after two days of being in. When I take them out, and hit them on the counter, they magically do an instant freeze! Almost cartoon-like. Whattheheckisgoingon? More specifically, 1) Why didn't they freeze in the first place? and 2) Why does the banging make them freeze?
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jphyq
Simple CFM question for squirrel cage fan
Dayton 6 inch fan with a 3/4 hp motor that spins at 1750 rpm. My Google fuuu is failing me, and I'm really wanting to mount this fan. It has a 6inch round intake and 7.1/4inch x 4inch rectangle on the out take. I've since made a adapter to take this rectangle out back, to 6 in round. I assume this should have no affect at all since the intake is only 6 inches as well. Any thoughts? Oh and this is a Dayton Housing and Motor. If that helps.
askscience
{ "a_id": [ "c2egph3" ], "text": [ "I'm not sure what you're asking exactly. The existing outlet size and the 6\" round duct are nearly the same cross section, so effectively you will see the same flow rate and velocity from both of them. There will be some losses in the transition, but it should be minor." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Simple CFM question for squirrel cage fan Dayton 6 inch fan with a 3/4 hp motor that spins at 1750 rpm. My Google fuuu is failing me, and I'm really wanting to mount this fan. It has a 6inch round intake and 7.1/4inch x 4inch rectangle on the out take. I've since made a adapter to take this rectangle out back, to 6 in round. I assume this should have no affect at all since the intake is only 6 inches as well. Any thoughts? Oh and this is a Dayton Housing and Motor. If that helps.
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sf47h
What causes humans to make mistakes on things we do everyday?
For instance: a typo on a word you type all of the time. What causes these little mistakes on tasks we do a million times? Are we complacent, tired or something along those lines?
askscience
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What causes humans to make mistakes on things we do everyday? For instance: a typo on a word you type all of the time. What causes these little mistakes on tasks we do a million times? Are we complacent, tired or something along those lines?
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ztgpa
If you are wearing a hoodie in the rain and it gets completely soaked through,is there any benefit in keeping it on?
askscience
{ "a_id": [ "c67lbm7" ], "text": [ "It depends on what's the benefit you are looking for.\n\nIf you want protection from cold, then no. On the contrary, the contact with the soaked cloth will make you lose heat faster, and just being naked (in the rain) will probably be better.\n\nIf you want protection from the rain, say rain-drops not getting in your eyes, then yes - the hoodie will soak the rain, but divert it to the side / front and might help out with that :) (but might not...)\n\nif you want protection from people screaming \"Hey! This person is naked! Call the cops!\" then the hoodie will also help :)" ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
If you are wearing a hoodie in the rain and it gets completely soaked through,is there any benefit in keeping it on?
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2rv7gb
Is the length of a Meter arbitrary, or does it have to be a specific distance?
So i was reading and saw that in 1983, the meter was redefined as "the distance traveled by light in a vacuum during a time of 1/299792458 seconds". Is that length of time measurement arbitrary? Why did they decide on that value? Would the laws/equations we have still work if a different length of time was used to define a Meter? Would a Meter change if a second was defined differently? If, instead of being defined as "9192631770 times the period of vibration of radiation from the cesium atom", it was defined as a different number of vibrations, would that change a Meter? Would that affect laws/equations?
askscience
{ "a_id": [ "cnjociv", "cnjms92" ], "text": [ "The length of a meter has had various definitions over the course of history. Each time it gets redefined the goal has been to make it a measurement that is more precise and more universal. A measurement of \"1/10,000,000 the distance between the equator and the North Pole\" is fairly universal—it's usable anywhere in the world—but it's hard to get to be super accurate. That led to various other definitions that were all trying to give a better benchmark of how to measure a meter with one of the more recent ones being the distance between two marks on a platinum/iridium bar. This definition can be very precise, but it is not universal—you could not reproduce a meter if you don't have access to this bar. \n\nThat definition persisted until 1960 when a more universal, very precise reference was devised: 1,650,763.73 times the wavelength of orange-red emission from Kr-86. This is a definition that could be used anywhere. Similarly, at about the same time, the second was defined to be 9,192,631,770 times the period of radiation from the transmission between the two hyperfine levels of the ground state of Cs-133. From here it was possible to get a very precise measurement of the speed of light, which was known to be constant.\n\nIn 1983 the definition was moved around a bit and rather than defining the length of the meter and second, SI changed to defining the length of a second and the speed of light. The second kept its previous definition, while the previously measured speed of light was truncated to be exactly 299,792,458 m/s, which allows the meter to be the distance light travels in 1/299,792,458 seconds. As with all of the redefinitions, care was taken to keep the newly defined meter (or second, or speed of light) to be as close to the original definition as possible. That's why the number isn't just an even 300,000,000.\n\n********\n\nIn a somewhat related note I think it's a fun tidbit to bring up here that this whole topic is the reason why pi^2 m/s^2 ≈ g. I first noticed this relationship when I was in high school and thought it was just a random quirk of numbers, like how e^pi - pi ≈ 20. However, this actually derives from an archaic definition of the meter, which was \"seconds pendulum.\" Like the modern definition of the meter, this one actually defined a related quantity and allowed you to calculate the length of a meter. In this case, it stated \"1 meter = the length of a pendulum with a half-period of 1 second.\"\n\nUsing that definition we take the equation for the period of a pendulum (T = 2 * pi * sqrt(L/g)) and we start plugging in numbers:\n\n* 2 seconds = 2 * pi * sqrt(1 meter / g)\n\n* seconds / pi = sqrt(meter/g)\n\n* seconds ^2 / pi^2 = meter/g\n\n* g seconds^2 = pi^2 meter\n\n* g = pi^2 meter/second^2\n\nThis definition, as it turns out, is *actually* defining g to be pi^2 m/s^2 (9.87 m/s^(2), which is pretty close to the modern value), much in the same way that our current definition of the meter is defining c = 299,792,458 m/s. However, this definition is poor because it relies on the small angle approximation for a pendulum, has issues with friction and air resistance, requires a perfect pendulum (massless string, all mass concentrated at one point at the end of the string), and relies on there being a consistent gravitational acceleration everywhere on earth. All told it's a pretty awful definition of the meter which is likely why it never took off, but it still gives an interesting relationship.", "The meter was originally a ten-millionth of the distance between the equator and the North Pole. This was changed to something more precise, that was equivalent in length to the old definition. Likewise, the second was 1/86400 of the Sun's apparent rotation period around the Earth, but this was changed to something more precise, because days aren't always the same length.\n \nPhysics is independent of unit definitions." ], "score": [ 13, 6 ] }
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Is the length of a Meter arbitrary, or does it have to be a specific distance? So i was reading and saw that in 1983, the meter was redefined as "the distance traveled by light in a vacuum during a time of 1/299792458 seconds". Is that length of time measurement arbitrary? Why did they decide on that value? Would the laws/equations we have still work if a different length of time was used to define a Meter? Would a Meter change if a second was defined differently? If, instead of being defined as "9192631770 times the period of vibration of radiation from the cesium atom", it was defined as a different number of vibrations, would that change a Meter? Would that affect laws/equations?
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77hb4c
In the honor of the upcoming mole day, is it possible to calculate the molar mass of an avocado?
askscience
{ "a_id": [ "don4tkw", "doocrs7" ], "text": [ "A very simple approximation. \n\n12 grams of a sample of carbon-12 isotope contains one mole of substances as defined by Avogadro's constant. The mass of the avocado in grams divided by 12 gives us a ratio value, giving us the number of moles.\n\nThe ratio of the mass of the avocado to the amounts of substance gives us the \"molar mass\" of that ***specific*** avocado. Not all avocados \"are made equal\", but all element isotopes are equal more or less. \n\nEdit:\nThe avocado is not an element, you're absolutely right. But this can still be approximated as its total mass corresponds to its own amounts of the substance, which is what we need, that's all. \n\nI suggest starting with a dried avocado, for example, evaporation is a potential phenomenon that might not make the most \"perfect\" approximation.\n\nAlso, what defines a fruit anyway? Some people would include a property of water content. In biology, \"dried mass\" is an interesting concept.", "Sure, that would be quite easy. How much does an avocado weigh, something like 100 grams? Multiply that with Avogadro's number, 6.02*10^23, and you'll get the molar mass of avocados. This puts us at right around 1% of [the weight of the Earth](_URL_0_)." ], "score": [ 5, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "https://www.google.dk/search?client=ms-android-lenovo&ei=jyPrWbn9D8HPwQL0iqaoCw&sjs=3&q=weight+of+earth&oq=weight+of+eart&gs_l=mobile-gws-serp.1.0.0i70i251j0l4.177516.186067..188503.......178.1570.6j8............mobile-gws-wiz-serp.....3..35i39j0i67j0i203j0i20i263.xZhf8LWgRlk%3D" ] }
In the honor of the upcoming mole day, is it possible to calculate the molar mass of an avocado?
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2m4pcm
How do Philae's on-board systems store data, and how do they manage collective issues like total upward thrust generated by multiple operations?
Philae landing on Churyumov-Gerasimenko today is amazing on many levels. Brings up a couple of questions: * Mass storage on Philae: is it disks? If so, 1) how do they keep the torque of spinning up from throwing the craft off-course? (raid 5 disks spinning opposite each other?) and 2) how do they make the heads float over the platters - sealed noble gases at 1atm seems like a waste; or is it solid state storage? * Is there a main loop / master controller, or are most systems autonomous and message-passing between them, com module, etc? * Do the systems understand messages like "don't do anything that generates over X thrust in the up direction, summed with any thrusts generated by other processes in the same time-window", and how do they aggregate collective data like that?
askscience
{ "a_id": [ "cm1n8f0" ], "text": [ "> Mass storage on Philae: is it disks?\n\nDisks wouldn't do well with ionizing radiation in space, acceleration during launch and vibrations during stage separations. Usually different types of solid storage are used or even just volatile RAM, but in any case we're talking about [radiation hardened memory](_URL_0_).\n\n > Is there a main loop / master controller, or are most systems autonomous and message-passing between them, com module, etc?\n\nUsually the different instruments on board exchange data using a CAN bus or a *space wire* network. However the communications system acts as a centralizer for transmission to Earth, and in many cases a central controller is also present. Specifically, Philae has a [Command and Data Management System](_URL_1_).\n\n > Do the systems understand messages like \"don't do anything that generates over X thrust in the up direction, summed with any thrusts generated by other processes in the same time-window\", and how do they aggregate collective data like that?\n\nThis is taken care of at design time. They define a maximum torque and distribute it between the designers of each subsystem in the form of a budget.\n\nThrust is not something you would expect from most devices. However it happens in larger systems, e.g. in the ISS they have pipes that connect to the outside and can be used to provide vacuum for experiments. The outer end is made with several holes pointing in opposite directions to cancel out the thrust. But don't expect Philae to have such things.\n\nThat being said, some vibrations or movements of internal devices could push on the landing legs and cause it to jump. In the case of Philae, evidently, they've taken good care of this issue and made it quite stable since the harpoons failed and it is still there on the surface." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Radiation_hardening", "http://www.sgf.hu/newsgfweb3_005.htm" ] }
How do Philae's on-board systems store data, and how do they manage collective issues like total upward thrust generated by multiple operations? Philae landing on Churyumov-Gerasimenko today is amazing on many levels. Brings up a couple of questions: * Mass storage on Philae: is it disks? If so, 1) how do they keep the torque of spinning up from throwing the craft off-course? (raid 5 disks spinning opposite each other?) and 2) how do they make the heads float over the platters - sealed noble gases at 1atm seems like a waste; or is it solid state storage? * Is there a main loop / master controller, or are most systems autonomous and message-passing between them, com module, etc? * Do the systems understand messages like "don't do anything that generates over X thrust in the up direction, summed with any thrusts generated by other processes in the same time-window", and how do they aggregate collective data like that?
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a0i3ol
You often hear martial artists such as boxers loudly exhaling when throwing punches. Does this actually increase power output, and if it does, how do?
askscience
{ "a_id": [ "eaie3g2" ], "text": [ "Yes was doing some research on this a while back and learned it does for three reasons \n1. It helps release back muscles to add more force\n2. When you exhale real fast it helps stabilize the core\n3. It throws the opponents timing of be a half second or so( in tennis) don’t know how much in boxing" ], "score": [ 11 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
You often hear martial artists such as boxers loudly exhaling when throwing punches. Does this actually increase power output, and if it does, how do?
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2jhfow
What is "part-to-part" or "single part" force repeatability?
I have to order a resistor ([Link to product sheet](_URL_0_)) Unfortunately I do not know what "part-to-part" or "single part" force repeatability is. I get that it's like tolerance on a normal resistor, but how do the two differ?
askscience
{ "a_id": [ "clc4yq1" ], "text": [ "It looks like it's referring to the tolerances of the force sensing component. Part-to-part repeatability means that if you take a force measurement with one sensor, and then take the same reading with additional sensors (of the same model), they will all be within 6% of the mean. \n\nSingle part repeatability means that if you measure the same force with the same sensor, your readings will be within 2% of the initial value." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [ "http://www.trossenrobotics.com/productdocs/FSR_Integration_Guide.pdf" ] }
{ "url": [] }
What is "part-to-part" or "single part" force repeatability? I have to order a resistor ([Link to product sheet](_URL_0_)) Unfortunately I do not know what "part-to-part" or "single part" force repeatability is. I get that it's like tolerance on a normal resistor, but how do the two differ?
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1k6ww7
Is this incinerator legit?
I was approached by a guy for the sale of an waste incenerator today for use in homes. These are his claims. 1. 100% Eco friendly, zero pollution and user friendly 2. The process is done between 400 degree centigrade and 450 degree centigrade, with out the use of any fuel or electricity. 3. Capability to burn any waste, even wet items and plastic items. 4. Only residual will be white ash, which can be used as manure. 5. No maintenance required apart from cleaning and service. The guys claims this to be the result of his 6 year research. He is charging 35000 Rs for this item, which is like a months income for an average household around here. Can this be legit? If yes, how is it possible to maintain the fire with out using a fuel, or and active air supply, like a blower or a fan? If we use this, how much burnable waste (like paper) should we use in relation to the non burnable waste like wet items and plastic?
askscience
{ "a_id": [ "cbm2a73", "cbm2iys", "cbm3bnk" ], "text": [ "> 100% Eco friendly, zero pollution\n\n+ \n\n > Capability to burn any waste\n\n= \n\nBullshit right there. \n\nI would treat this with severe suspicion.", "It is not possible to burn wet things without either drying them out,\nor putting in lots of fuel to burn.\n\nAnother claim is that you can burn plastics. You can, but the fumes\nwill be toxic, and can poison you. This is not Eco/User friendly.\n\nYou can use some ash as fertilizer, but the ash has to come from\na wood fire. It can't contain food scraps or plastic.\n\nIt is true that there are countries that burn waste for energy, but\nthey use very big expensive processing plants to do so.\n\nThis is a scam.", "> with out the use of any fuel or electricity.\n\n > No maintenance required apart from cleaning and service.\n\nSounds like it might be a solar oven/furnace.\n\nYes, they work and get hot.\n\nI'm suspicious of the other claims here." ], "score": [ 5, 4, 2 ] }
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Is this incinerator legit? I was approached by a guy for the sale of an waste incenerator today for use in homes. These are his claims. 1. 100% Eco friendly, zero pollution and user friendly 2. The process is done between 400 degree centigrade and 450 degree centigrade, with out the use of any fuel or electricity. 3. Capability to burn any waste, even wet items and plastic items. 4. Only residual will be white ash, which can be used as manure. 5. No maintenance required apart from cleaning and service. The guys claims this to be the result of his 6 year research. He is charging 35000 Rs for this item, which is like a months income for an average household around here. Can this be legit? If yes, how is it possible to maintain the fire with out using a fuel, or and active air supply, like a blower or a fan? If we use this, how much burnable waste (like paper) should we use in relation to the non burnable waste like wet items and plastic?
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1g2mz7
Can someone explain anapoles to me?
[This article](_URL_1_) was posted in /r/science earlier and hypothesizes that dark matter may have anapoles instead of normal electric charge. I looked it up on [wikipedia](_URL_0_), but the article is pretty difficult to follow. What exactly is this and why is it different from regular electromagnetism?
askscience
{ "a_id": [ "cag7sos" ], "text": [ "It is not different from regular electromagnetism per se, we just don't really encounter them much except inside some particular material systems.\n\nNow, down to business. First off, an 'anapole' does not necessarily refer to a different kind of charge than that of electromagnetism. Monopole or dipole or quadrupole or octopole ETC are words we use to describe the electric (or magnetic) field emanating from a particular spatial distribution of charge (or current). \n\nThats the basic idea. When objects don't behave like point charges and instead have their charge spread out over a region (perhaps a very small region, like an electron zipping about an atom) their fields become more complicated. To describe these more complicated fields we break them down into simpler 'archetypical' field patterns, thats what all the poles are.\n\nThe following are examples for electric fields:\nMonopole field means a field that looks like it emanates from a point charge.\nDipole field means the sort of field that emanates from something like a charge dumbbell (positive at one end and negative at the other)\nETC\n\nWe physicists will look at more complicated fields and break them down as a sum of these different 'archetypical' fields, Similar to writing a position vector as a some of components.\n\nNow that that is covered we can tackle your question about what an anapole is. An anapole is the particular pattern of a magnetic field that is produced by a torus of current. So imagine taking a rubber hose and wrapping copper wire around it to make a solenoid, like this:\n\n_URL_0_\n\nNow you bend your coil of wire around into a circle so it forms a closed torus. Basically you make your long cylindrical coil of wire into a donut. If you run current through this wire the pattern of the magnetic field that it produces will be an anapole pattern.\n\nSo the theory the /r/science article is discussing deals with the possibility of particles of matter that by some means of their basic composition display charge/current distributions that cause them to display and interact via anapole fields. \n\n\nAside: While anapoles aren't that common, particles and materials that interact electromagnetically via fields of some other 'pole' than basic point charge fields (monopole) are quite common. Example:Hydrogen bonds, van der Waals interactions (dipole fields are at play in both of these)\n\nEDIT: Some typos" ], "score": [ 2 ] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Toroidal_moment", "http://www.reddit.com/r/science/comments/1g24kr/simple_theory_may_explain_dark_matter_most_of_the/" ] }
{ "url": [ "http://www.societyofrobots.com/images/actuators_solonoid_magnetic_field.gif" ] }
Can someone explain anapoles to me? [This article](_URL_1_) was posted in /r/science earlier and hypothesizes that dark matter may have anapoles instead of normal electric charge. I looked it up on [wikipedia](_URL_0_), but the article is pretty difficult to follow. What exactly is this and why is it different from regular electromagnetism?
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1opn74
Military Grid Reference System and Curvature of the Earth.
The Pythagorean Theory states that A^2 + B^2 = C^2 can be used to find a distance between two points on a grid system. Using the Military Grid Reference System, is it necessary to additionally account for the curvature of the earth? If so, how? Thank you for any help.
askscience
{ "a_id": [ "ccuhxmg" ], "text": [ "Former US Army Intel, (HUMINT) Cartographer, and Marksman here...\n\nThe principal you're looking for is outlined here: _URL_3_\n\nAlso important to note, that over especially long ranges you need to take in account _URL_0_.\n\nThe distance it takes an object to reach it's target, is NOT the same as the distance between the two objects. The Pythagorean theorem is for static, straight line measurements.\n\nAnd since the surface of the earth is fixed (IE: the curvature doesn't really change that much, there's really no need to measure \"how much does the earth curve\" as you are asking. It's easier to formulate how much gravity exerts on the projectile down towards earth, and compensate for that. Very rarely does a projectile actually follow the \"curve\" of the earth.\n\nWhen I was in training, this was explained to me like this: \"Doesn't matter if it's a bullet, missile, bomb, shell or rocket... They're all artillery.\"\n\nQuick Edit, for extreme (continent-to-continent) ranges, there's a formula for that called the \"Great Circle\" formula. _URL_1_ \n\nAnother Edit to further define how the military grid system works:\n\nThe military grid system is a system of **fixed**, increasingly smaller, squares used for finite point to point targeting and locating.\n\nGrids are first identified using two letters representing the country or geolocation of the large scale or \"master grid\" EG: A map starting with IZ will be within the country of Iraq.\n\nThe next is a range of numbers (usually two to eight digits.) The more digits, the smaller the grid (ranging from KM all the way down to a meter.)\n\nIn the example below, I am using a schema of letters to better explain the workings, because if I used numbers, that shit would get confusing. It's not about the numbers (numbers just tell you the location within that map) but about the digits. Just keep in mind a real grid coordinate will us numbers (Example: IZ83094268)\n\nSo a Grid Coordinate of IZxx will yeild you a 1000km by 1000km map of a location in Iraq.\n\nA Grid Coordinate of IZxxzz will yeild you a 100km by 100km map of a smaller area within the lager xx 1000km map.\n\nA Grid Coordinate of IZxxzzyy will yeild you a 1km by 1km map of a smaller area within the zz 100km area.\n\nA Grid Coordinate of IZxxzzyyaa will yeild you a 10m by 10m map of a smaller area within the yy 1km map.\n\nAnd for high precision munitions, a ten digit will be used that will yield a 1m by 1m map or area. That's just a tad more than a 3 foot by 3 foot square. And yes, artillery units can hit it.\n\nNow, in regards to your question, the Pythagorean theorem is used in finding the straight-line distance between two grid coordinates, but the curvature of the earth does not need to be calculated.\n\nHere is a diagram that will help me explain why: _URL_2_\n\nIn this example, we are firing a projectile from point A to point B. The projectile will follow the red dotted line. The curve of the earth is the orangish-brownish solid line, and the point-to-point distance is the green dotted line. We use pythag's formula to calculate the green line's distance, at which point we take that number and plug it into the other formulas I have mentioned above, and some that I haven't (too detailed to mention in detail here) which calculate the projectiles path to land at target B.\n\nBottom line is, we don't have to calculate the curve of the earth to hit it with a projectile with extreme accuracy. So we don't. And even if we did, there's a formula for that (Great Circle, see above.)" ], "score": [ 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Axial_tilt", "http://en.wikipedia.org/wiki/Great_circle", "http://i.imgur.com/ZUUl9hU.png", "http://en.wikipedia.org/wiki/Coriolis_effect" ] }
Military Grid Reference System and Curvature of the Earth. The Pythagorean Theory states that A^2 + B^2 = C^2 can be used to find a distance between two points on a grid system. Using the Military Grid Reference System, is it necessary to additionally account for the curvature of the earth? If so, how? Thank you for any help.
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1h3hvk
How do standing waves help explain the quantised energy states on an atom?
How exactly does this work? I've been scouring the internet for a definition that helps me as a year 12 (Senior) physics student... They are either too broad or too complicated!!
askscience
{ "a_id": [ "caqis7t", "caqhklw", "caqofh2" ], "text": [ "Consider a string with both ends clamped in place. Now assume that something causes the string to begin to vibrate. Since both ends are clamped, the only wave motions that can be sustained on the string are those which have nodes at both ends. This means that only waves whose wavelength is an integer multiple of the string length can exist on the string (otherwise it would not have nodes at both ends). Thus the allowed vibration modes (the ways it can vibrate) are catalogued by an integer, there is no continuum of allowed vibration modes for the string, only those that fit the integer constraint on the wavelength.\n\nStanding waves naturally give rise to integral quantisation (i.e. a set of allowed states enumerated by an integer). \n\nIn quantum mechanics a particle is described by a wavefunction which contains all the information about the particle and behaves very much like our intuitive concept of a wave. When determining energy levels in an atom we can focus (for simplicity) on the outer-most electron, assuming each state this electron is allowed to occupy corresponds to an energy level for the atom. The only orbits the electron can be allowed to have are those that result in a meaningful wavefunction (otherwise we will lose physical information about the electron). If we think of the orbits as circles (for simplicity once more), the only orbits that give us meaningful wavefunctions are those with a circumference which accommodate the wavelength of the wavefunction an integer number of times. Though it is harder to see than the requirement of having nodes at both string ends, exactly the same principle is in operation here, we are fitting a wave into a set of \"boundary conditions\", this time our boundary condition is that the wavefunction joins up seamlessly after moving around the closed orbit. Again we find a situation where the allowed number of states is restricted to fit a condition involving an integer. We can think of the wavefunction being restricted to forming standing waves in each allowed orbit and this produces the quantisation of allowed states.", "Ok so let me try and explain it.\n\nElectrons, due to the particle-duality of matter, can behave both as waves and as particles. The wavelength of the electron is called the \"De Broglie Wavelength\", which is given by the equation lambda = h/p, where lambda is the wavelength p is the momentum and h is plank's constant.\n\nThus, as electrons are waves with a specific wavelength, there are certain \"orbits\" around the nucleus which would be a whole multiple of the wavelength, which (as I assume you've learnt) causes resonance. These orbits are the familiar s, p, d and f orbitals, along with their respective sub-orbitals.\n\nWhile this analogy is good for visualizing it, it has many limitations. In reality, you have to solve the Schrodinger equation (pretty complex partial differential equation) to find the resonance (taking into account all the properties of the electrons including spin and density), and then take the norm (magnitude) and square it to find the probability of an electron being in a specific place.", "The other answers here are pretty good so I'll just add a bit.\n\nThe first thing I have to say is that the quantum states of an electron are not always \"quantized.\" If you have an electron out in space far away from other stuff it's possible quantum states are actually basically the same as what you would normally expect for a little massive particle in classical physics. The momentum and position can be any real number.\n\nAs stated by others here, quantum mechanics treats matter as excitations of waves. You can think of an electron in the same way you think of the ripples formed if you dip your finger in a pool of water, or like the vibrations of a guitar string. The universe is permeated by an \"electron field\" (that's the string) and individual electrons are in a loose sense quanta of energy vibrations in the field.\n\nIf you have an infinitely wide uninterrupted pool of water then the ripples you make will travel indefinitely. Whether you dip your finger at a high or low frequency the resulting ripples will propagate. If the pool has edges the ripples will reflect and the returning ripples will interfere with the outgoing ripples. This makes it such that only certain frequency ripples will interfere constructively and result in standing waves. You can actually do this experiment in a bathtub or a sink. Try it.\n\nThe guitar string is the same situation. By clamping the string on both ends we make it so that only certain frequencies on the string result in the reflecting waves interfering constructively. This is exactly what \"chooses\" the pitch of the string, and is why pressing the strings down at different frets changes the pitch.\n\nWhen you have an external force acting on the electron such as the Coulomb force between the electron and the proton in a hydrogen atom it changes the boundary conditions on the electron field. This does exactly the same thing that happens in the water and string systems: it makes only certain frequencies allowed. The other ingredient in quantum mechanics is the fact that particle energy and wave frequency are related through Planck's constant, E = h * f (Energy equals Planck's constant times frequency). The result is that when you have boundary conditions from something like an atomic nucleus only certain wave frequencies, and thus energies, exist because of wave interference.\n\nP.S. There's little in quantum mechanics that you can't understand by thinking about waves. Even the uncertainty principle..." ], "score": [ 3, 3, 2 ] }
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How do standing waves help explain the quantised energy states on an atom? How exactly does this work? I've been scouring the internet for a definition that helps me as a year 12 (Senior) physics student... They are either too broad or too complicated!!
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1opbjx
Can somebody explain Bell's Theorem using the "envelope" analogy?
Entanglement can be explained rather easily by saying $10 is split between two envelopes -- when you open up one, you'll immediately know how much is in the other (regardless of their distance). How can one extend this analogy to adequately describe Bell's Theorem?
askscience
{ "a_id": [ "ccughn2" ], "text": [ "Envelope analogies are what Bell's theorem are attempting to disprove, a local realism. They're the paradigm of classical physics: properties of the system are determined (realism), and information can't travel faster than light (locality). The prediction of how measurements of the system change based on how the measurements are made rooted in local realism do not match either quantum mechanical predictions nor experimental results. Quantum mechanics excludes local realism, and experiments currently favor the quantum mechanical hypothesis. So, both locality and realism can't be true. Locality is assumed in quantum field theory, so realism, the idea that properties are determined, is the easier to abandon. In terms of money in the envelopes, realism says that when the $10 is split up and the envelopes are sealed, the money inside the envelopes is set. The real world seems to actually function in a way that while the total between the two envelopes is set, the actual amount in each envelope isn't set until one of the envelopes are open. It's not that we don't know how much is in each envelope, it's that the envelope doesn't know. The system exists in all possible states, until an interaction (observation) forces it out of states inconsistent with the interaction.\n\nDoes that make sense?" ], "score": [ 6 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Can somebody explain Bell's Theorem using the "envelope" analogy? Entanglement can be explained rather easily by saying $10 is split between two envelopes -- when you open up one, you'll immediately know how much is in the other (regardless of their distance). How can one extend this analogy to adequately describe Bell's Theorem?
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4ykif7
How does STD Transmission work?
In recent months, I've become curious about how STD's such as HIV, gonorrhea, herpes, etc are transmitted between partners. Withholding transmission mediums such as IV needles and the like, how does STD transmission occur during sex? More specifically, why are some STD's (such as HIV) more likely to be transmitted via (unprotected) penetrative sex than oral sex? My original intuition is that the infected bacteria only need to find an entry point into the body and at that point the person will become infected. Seemingly, this would make oral sex just as dangerous as penetrative sex. Obviously I am here to learn from individuals much smarter than myself so I look forward to your input. Thanks in advance.
askscience
{ "a_id": [ "d6ohjo9" ], "text": [ "Infectious bacteria and viruses don't just infect \"the body\", but usually have specific body parts or cell types that they can survive and grow inside of. You can think of it similar to how animals can be the top predator in certain ecosystems but would be unable to survive in others. A polar bear from Canada could probably do pretty well in Greenland, but if you put it in Egypt it wouldn't survive.\n\nSimilarly, some organisms can infect the cells of the reproductive tract, but can't survive in other areas. We call these \"sexually transmitted infections\" because this is the main way that they get spread, but it isn't the only.\n\nHIV can survive in reproductive cells and the rectum, but is quickly killed within the mouth. Its ultimate target is immune cells, so you can also get infected if it is directly put into the blood stream. So oral sex is not a risk factor for HIV, but vaginal sex, anal sex, and needle-sharing can lead to infection.\n\nGonorrhea infects the reproductive tract, but it is also pretty good at surviving inside the throat. So oral, anal, and vaginal sex are all possible of transmitting it. Unlike HIV, it usually doesn't survive anywhere else in the body such as the blood, so you are unlikely to catch it via sharing needles. \n\nConversely, viruses that cause the common cold can easily survive in the throat, but they would not be able to survive in the reproductive tract. So kissing can transmit a cold virus, but oral sex is not going to.\n\nHope this answers your question!" ], "score": [ 18 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
How does STD Transmission work? In recent months, I've become curious about how STD's such as HIV, gonorrhea, herpes, etc are transmitted between partners. Withholding transmission mediums such as IV needles and the like, how does STD transmission occur during sex? More specifically, why are some STD's (such as HIV) more likely to be transmitted via (unprotected) penetrative sex than oral sex? My original intuition is that the infected bacteria only need to find an entry point into the body and at that point the person will become infected. Seemingly, this would make oral sex just as dangerous as penetrative sex. Obviously I am here to learn from individuals much smarter than myself so I look forward to your input. Thanks in advance.
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tqxjg
Does anyone have information about "Phantom Hairs"?
Every now and then, I notice a hair growing out of my face, or neck, or ear, that is really long. So long that there is no chance I wouldn't have noticed it if it had been there for more than a day or two. They must have grown literally over night. I did some googling, and I think the phenomenon might be called "Phantom Hairs" but I couldn't find enough information to substantiate that this is what I actually have experienced, or to explain the cause. The hairs are usually very fine. Does anybody have information about this phenomenon?
askscience
{ "a_id": [ "c4oym9v" ], "text": [ "> there is no chance I wouldn't have noticed it if it had been there for more than a day or two. They must have grown literally over night.\n\nYou're going to have to provide more support for that premise. Unless you frequently shave the area, it's far more plausible to believe that you simply haven't noticed." ], "score": [ 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Does anyone have information about "Phantom Hairs"? Every now and then, I notice a hair growing out of my face, or neck, or ear, that is really long. So long that there is no chance I wouldn't have noticed it if it had been there for more than a day or two. They must have grown literally over night. I did some googling, and I think the phenomenon might be called "Phantom Hairs" but I couldn't find enough information to substantiate that this is what I actually have experienced, or to explain the cause. The hairs are usually very fine. Does anybody have information about this phenomenon?
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129uvz
If I somehow tricked a boa constrictor into thinking I was dead, for how long could I survive it devouring me?
askscience
{ "a_id": [ "c6tc5m6" ], "text": [ "The boa won't be tricked unless your body temperature drops." ], "score": [ 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
If I somehow tricked a boa constrictor into thinking I was dead, for how long could I survive it devouring me?
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32g968
How did they detect Amino Acids in Sagittarius B2?
I'm just curious if someone could please break down how they did this. I understand that they were detected in the gas cloud by ALMA, but it just seems beyond me that it is capable of seeing something so tiny, so far away. Is the radiation emitted that strong, or is it just the fact that there is a lot of them? I'm so confused on how it's possible to find something microscopic in space that far away. They seem absolutely certain that's what it is. Is it possible that something else is causing this radiation? Why is the radiation so strong?
askscience
{ "a_id": [ "cqbpc2j", "cqbpk9y" ], "text": [ "See [this recent post](_URL_0_). You're not seeing the molecules themselves, just the emitted radiation. There's a lot of them, enough so that the emitted light at specific wavelengths is detectable by ALMA.", "Not amino acids, just hydrogen cyanide and methyl cyanide, which can combine into amino acids under the right conditions. There's a huge cloud of these in that system, enough to fill Earth's oceans. The composition of the cloud is determined by its absorption spectrum." ], "score": [ 5, 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.reddit.com/r/askscience/comments/32c7pm/how_can_the_alma_telescope_observe_presumably/" ] }
How did they detect Amino Acids in Sagittarius B2? I'm just curious if someone could please break down how they did this. I understand that they were detected in the gas cloud by ALMA, but it just seems beyond me that it is capable of seeing something so tiny, so far away. Is the radiation emitted that strong, or is it just the fact that there is a lot of them? I'm so confused on how it's possible to find something microscopic in space that far away. They seem absolutely certain that's what it is. Is it possible that something else is causing this radiation? Why is the radiation so strong?
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trvj5
Underwater Cave/Air Pocket/Breaching
What would happen if you had an underwater cave that had a large air pocket in it, which you then drilled down into, putting a hole in the ceiling of the caves air pocket, which opens into a large body of water? I imagine the air would escape through the newly made hole, but how? If there is a torrent of water pushing down that fills the hole, then how could the air press through it? Or would it? Would the air simply compress to the point where it has the strength to stop the water and push it back, allowing it to pass through the hole until it lost it's pressure again?
askscience
{ "a_id": [ "c4p6pil", "c4p6wfo" ], "text": [ "Water would flow down, and the air would bubble up the newly drilled tube. There's nothing particularly unusual about the scenario you describe.", "Not just a hypothetical: [Lake Peigneur drilling disaster](_URL_0_)." ], "score": [ 3, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.losapos.com/lakepeigneur" ] }
Underwater Cave/Air Pocket/Breaching What would happen if you had an underwater cave that had a large air pocket in it, which you then drilled down into, putting a hole in the ceiling of the caves air pocket, which opens into a large body of water? I imagine the air would escape through the newly made hole, but how? If there is a torrent of water pushing down that fills the hole, then how could the air press through it? Or would it? Would the air simply compress to the point where it has the strength to stop the water and push it back, allowing it to pass through the hole until it lost it's pressure again?
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adwe7f
Does the scaphoid consist entirely of cortical bone?
And if not, what other texture does it consist of? Is there a known Poisson's ratio and Young's modulus for the scaphoid? I'm trying to work it out for an orthopedics project and I haven't found an answer to it in the papers I've read so far. It might be because I'm at a German university and don't have access to all of the important journals, so I figured I'd ask this subreddit. Thank you in advance!
askscience
{ "a_id": [ "edm1jzs" ], "text": [ "You’ll need journal access for the exact numbers, but [this paper](_URL_0_) is a good breakdown of the bone types in human carpals (and metacarpals). Broadly, however, the answer is no...carpals, as with other “short bones”, are mostly trabecular bone with only a very thin coating of cortical bone on the outside.\n\n[This one](_URL_1_) is also interesting, a comparison of how human carpal trabecular bone proportions compare to the carpals of other primates whose wrists are greater loads...either by knuckle walking or, in the opposite direction, by tree-swinging. Our wrists are the only primate wrists that are “manipulative” in their primary use, and the bone structure and density reflects that shift." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "https://www.sciencedirect.com/science/article/pii/S0047248417304487?via%3Dihub", "https://www.ncbi.nlm.nih.gov/m/pubmed/24323904/" ] }
Does the scaphoid consist entirely of cortical bone? And if not, what other texture does it consist of? Is there a known Poisson's ratio and Young's modulus for the scaphoid? I'm trying to work it out for an orthopedics project and I haven't found an answer to it in the papers I've read so far. It might be because I'm at a German university and don't have access to all of the important journals, so I figured I'd ask this subreddit. Thank you in advance!
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44gr75
What does almost surely mean in the statement of the law of large numbers?
[deleted]
askscience
{ "a_id": [ "czq41f0", "czq38de" ], "text": [ "So the law of large numbers (LLN) has a few versions. The one you mentioned is the strong law of large numbers (SLLN). There’s also a weak version (WLLN). The strong law of large numbers automatically implies the weak law, but the weak law is much simpler to prove.\n\nWe have a concept of convergence in analysis. But the definition is for deterministic sequences, and it does not immediately apply to a sample average, which is random depending on the sample. \n\nI’ll give a few probability definitions so it’s easier to follow the rest of the discussion.\n\n**Definition: Probability space**\n\nSay we have a random object. We aren’t sure what the random object is like exactly, but we know that the set of all possible objects it can be is in some set S. So for example, let’s assume we toss a coin an infinite number of times, getting heads or tails each time and writing down the sequence of results. For instance if we get heads then tails, then heads, we write down HTH…. We don’t know what sequence we’ll get when we begin tossing the coin, but it can only be in the set S={all infinite sequences with H, T as terms}. So this set contains the all heads sequence HHHH…, alternating heads and tails sequence HTHTH… and uncountably many more sequences. We call the set S the sample space for the infinite coin tossing experiment. In this way, the question of “what will my tosses look like as I throw my coin infinite number of times?” becomes “what infinite sequence will I randomly choose from S?”\n\nWe also see how likely sets of these sequences are. For example, we want to say how likely it is that the first 5 tosses will be heads. That is, we want to know how probable the set {sequences which start with HHHHH} are. It turns out that to define nice probabilities that make sense, we sometimes want to restrict what sets we can assign probability to. So we define a special collection of subsets of the sample space S (called a sigma algebra F). To have a collection of subsets be a sigma algebra, the empty set must be in the collection F (so we can say how likely it is that the random coin toss sequence is in the empty set), the complement of a set in the collection must also be in the set (so if we can say how likely the first 5 tosses are heads, we can also say how likely that at least one of the first 5 tosses is not a head), and a countable union (and by complementation, intersection) of sets in the collections must also be in the set (so if we can say how likely it is that the first n tosses are heads, for any n, then we can say how likely it is to get all heads (the singleton set {sequence HHHHH… infinitely} is a countable intersection of the sets {all sequences HHHHH…HH n times}). We call the sets in the sigma algebra F events. \n\nWe also define the probabilities on these events using a probability measure P. It assigns to each event a real number between 0 and 1 inclusive. The measure satisfies familiar properties, the probability of the empty set is 0, the probability of the entire sample space S is 1 and the probability of a countable union of disjoint sets A1, A2 is the sum of the probabilities P(A1) + P(A2) +…\n\nTogether the triple (S, F, P) is a probability space.\n\nIn the infinite coin toss probability space example, for any finite sequence of n terms, the sigma algebra contains the set of all infinite sequences that begin with that finite sequence (e.g. {all sequences that begin with HTHHTH...}) etc. The probability measure gives to each of these sets above the probability 1/2^n.\n\n**Definition: Almost surely**\n\nWe say that an event A in F almost surely happens if P(A) = 1.\n\n**Definition: Random Variable**\n\nA real-valued random variable (r.v.) X is defined on a probability space. X is a function that assigns to each outcome in S, a real number or +-infinity. It also must satisfy the additional property that for any real number a, the set {w in S such that X(w) < = a} is an event in the sigma algebra F. This additional property guarantees us that we can probabilities like P(X < =a) = P({w in S: X(w) < = a}) make sense, as P is only defined on sets in F. For example, a sequence of random variables on S is given by X_n, where X_n(w) = 0 if the nth term in the sequence w is T, 1 if the nth term is H. \n\nNow we can define arithmetic on random variables in the obvious way, pointwise. So the sum of random variables X and Y, X+Y is defined by (X+Y)(w) = X(w) + Y(w) for any w. Similarly for the other operations.\n\n**Definition: Distribution of a random variable**\n\nWe define the (cumulative) distribution of a random variable X as the function F_X (domain real numbers, codomain [0,1]). For any real number a, F_X(a) = P(X < =a).\n\n**Definition: Identically distributed random variable**\n\nWe say the collection {X_k} of random variables is identically distributed if for all k, X_k has the same distribution. Note that identically distributed random variables are not always equal, i.e. if we have for r.v.s Y and Z that F_Y = F_Z, then this does not imply Y = Z.\n\n**Definition: Independent random variables**\n\nWe say a collection of random variables {X_k} are (mutually) independent if for any finite set {X_k1,…, X_kn} of random variables in {X_k} and for any finite set of real numbers {a_1,…, a_n}, P(X_k1 < = a_1, X_k2 < = a_2,…, X_kn < = a_n} = P (X_k1 < = a_1) P(X_k2 < =a_2) … P(X_kn < = a_n). \n\n**Definition: Convergence**\n\nWe say a sequence of real numbers x_n converges to x if for every positive real number e, there exists a number N such that if n > N, then |x_n – x| < e. That is no matter how close you want to get to x, there is always a point such that all sequence terms beyond that point are closer than that to x.\n\n**Explanation of SLLN:**\n\nI can finally get down to what the strong law of large numbers (SLLN) formally says:\n\nGiven a sequence of independent and identically distributed random variables X_n defined on the probability space (S, F, P), calculate for each n, the mean Y_n = (X_1 + … + X_n)/n.\nThen P(Y_n converges to E(X_1)) = P({w such that Y_n(w) converges to E(X_1)}) = 1.\n\nLet me break it down. We have a sequence of random variables X_n defined for all n. We also have that the collection {X_n} is independent (i.e. the joint probabilities are equal to the products) and identically distributed (all their distributions, and hence all their expectations E(X_1),…, E(X_n),… are equal. So we can say the same thing about the X_n converging to E(X_2), etc.\nNow the mean Y_n is defined pointwise as above, Y_n(w) = (X_1(w)+…+ X_n(w))/ n for all n and w. Now the probability of Y_n converging to the constant E(X_1) is the same as the probability of the set of all w such that Y_n(w) converges to E(X_1). And the theorem says that the probability of that set is 1. The proof is long so I won’t write it here.\n\nLet me continue the coin tossing example and connect it back to your question. We already defined w in S as one of the infinite sequences with terms H and T. We also defined X_n(w) as 0 if the nth term of w is T, 1 if the nth term is H. Now interpret each of your coin tosses as Bernoulli trials with a fair coin. Whether you get a head or tails on each toss is independent of the other tosses, and for each toss the probability of getting a heads = probability of getting tails = 0.5.\n\nNow then we have Y_n being the average of the first n results, e.g. if you get the sequence w with the first terms being heads, heads, tails, heads, tails,… you have Y_1(w) = 1, Y_2(w) = 1, Y_3(w) = 2/3, Y_4(w) = ¾, Y_5(w) = 3/5,…\n\nEach {X_1,…, X_n} is a sample, and Y_n is the sample average for the first n trials.\n\nFor all n, E(X_n) = 0 P(X=0) + 1 P(X=1) = 0 P(getting a tail on the nth toss) + 1 P(getting a head on the nth toss) = 1 . 0.5 = 0.5 \nIn this case, since we have X_n being i.i.d., the SLLN says that P({w such that Y_n(w) converges to 0.5}) = 1. So we are saying that with probability one, we have a sequence of tosses w such that the sample average Y_n(w) will be closer than e to 0.5 after a certain point, for any positive real number e.\n\nWhy is the phrase “almost surely” important? Because while with probability one, the sample averages converges, there are still non-empty zero probability events where the sample average does not converge to ½. There are still outcomes in these zero probability events, so it is not certain that the sample average converges to the expected value.\n\nFor example, we earlier talked about the singleton event {HHHHH… infinitely}, i.e. the case where we get heads for every toss. Now we can prove that P({HHHH…}) = 0 (intuitively you have the probability of getting n heads in a row being ½^n, so take the limit and you get 0). Take the sequence w = HHHHHH…. Then for all n, X_n(w) = 1 and Y_n(w) = 1. But E(X_1) is still 0.5 since we still have the same formula from above (E(X_1) = Probability that the first toss is heads). So Y_n(w) does not converge to E(X_1), since Y_n(w) stays at least ½ apart from ½ for all n. So while we have zero probability that we get all heads, it can conceivably still happen, so we say the sample average Y_n converges almost surely to E(X_1). \n\n**Explanation of WLLN:**\n\nThe WLLN says that if you take any positive number e, the probability that |Y_n – E(X_1)| > e tends to 0 as n tends to infinity. That is, that for any positive probability d, you can find an N such that the probability that Y_n is further than e from E(X_1) is less than d.\n\nThis is weaker than the strong law because (intuitively) you can still have, for some positive e, Y_n being further than e from E(X_1) with positive probability for infinitely many n, but the probability of this happening must get closer to 0 as n tends to infinity. The strong law does not allow this to happen, since SLLN says right away that the probability of Y_n not converging to E(X_1) is 0, and hence for any positive e, Y_n cannot be more than e from E(X_1) infinitely many times with positive probability.", "It's probably better to think of a simpler example first. Consider an infinite sequence of H and T (which are meant to be heads and tails). The probability of getting all H in the first *n* tosses is (1/2)^(n), which goes to 0 as *n* goes to infinity. So there is probability 0 that the entire sequence is all H. In other words, we can say that you will get at least one T, almost surely.\n\nFor the LLN, there are certainly events which do not satisfy the conclusion of the theorem. In our coin-tossing example, a sequence like HTTHTTHTT... (HTT repeated forever) does not satisfy the LLN because the running average approaches 2/3 (give T a value of 1 and H a value of 0), instead of 1/2. However, all events which do not give a limiting running average of 1/2 have probability 0 of occurring. So we say that LLN holds almost surely." ], "score": [ 7, 2 ] }
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What does almost surely mean in the statement of the law of large numbers? [deleted]
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22dyi8
Why is Bragg's law empirically correct?
(worded as a question now). In x-ray diffraction, Bragg's law states the relationship between the lattice spacing of a crystal and the wavelength and incidence angle of incident radiation to that crystal. [Bragg's Law](_URL_0_) I understand the proof of the law (it's just geometry), but I have a few question's about why it works in practice: 1. Why is the incidence angle equal to the diffraction angle? Why do photons see the diffracting planes of atoms as "planes," when the EMF around the atoms in the crystal isn't planar? 2. What properties/fields causes a diffraction event? More generally, for any interaction between a photon and any particle with mass, which fields are interacting? 3. What is the extent of the "trail" of a photon? How far ahead of one photon can another in-phase, parellel, and laterally near photon be, while still interfering with it constructively (or destructively, if out of phase)? 4. Why do powders produce clear diffraction lines? In a material with millions of randomly oriented crystals, why do clear diffraction lines at any angles exist (suggesting that the planes of randomly oriented crystals favor a specific orientation)? Sorry if this is too specific. I also don't know quite what discipline this falls under.
askscience
{ "a_id": [ "cgm0w60", "cgm0m76", "cgmb8j4" ], "text": [ "These are all some of the best questions I've seen posted here in a long time, and I feel bad that I can't really give them as good a treatment as they deserve. I hope someone else can call me out on my bullshit below, because odds are good I get something wrong. \n\n > Why is the incidence angle equal to the diffraction angle? Why do photons see the diffracting planes of atoms as \"planes,\" when the EMF around the atoms in the crystal isn't planar?\n\nBecause it is spherically symmetric, so what matters is where we find the \"scattering center.\" Basically when particles/light scatter off of different scattering centers, the geometry of the scattering centers (the spacing and lattice of the atoms) will determine what angles will yield constructive and destructive interference, giving maxima at very specific angles, which line up with the planes of atoms in the material. [The angles that make for constructive interference will have to line up with the planes](_URL_0_), because otherwise there will be considerable destructive interference. That gives you your Bragg condition. \n\n > What properties/fields causes a diffraction event? More generally, for any interaction between a photon and any particle with mass, which fields are interacting?\n\nBragg scattering is just a straight forward application of scattering theory. Things (ie particles) interact via some force (so there is a potential between them) and in this case it's the electrostatic potential. \n\n > What is the extent of the \"trail\" of a photon? How far ahead of one photon can another in-phase, parellel, and laterally near photon be, while still interfering with it constructively (or destructively, if out of phase)?\n\nWell remember that photons are wave packets, so they are spread out over some space. [Here's an example of electron interference that captures the gyst of it (pay close attention to the blue spots on top of the animations, those capture the particle amplitudes fairly well).](_URL_1_) In general, they have to be fairly close in order for the interference patterns to be noticeable; by fairly close, I mean their separation is on the order of their deBrogle wavelengths. \n\n > Why do powders produce clear diffraction lines? In a material with millions of randomly oriented crystals, why do clear diffraction lines at any angles exist (suggesting that the planes of randomly oriented crystals favor a specific orientation)?\n\nPowder diffraction (which is a technical term I believe) is quite different from Bragg scattering, as you noticed. In the powder, you assume that every possible grain structure and size is present, so your diffraction pattern just ends up being the diffraction pattern of your average grain size, which would be a halo. You're basically doing diffraction from a circular aperture.", "It's important to note that Bragg's law is a result of *lattice* planes, not planes of atoms. It is the periodicity of the crystal lattice that is responsible.\n\nBragg's law isn't actually a geometric argument, the geometry is just a simple interpretation. Bragg's law is actually derived from the Laue equations.\n\nThese are just common misconceptions, hopefully it'll help you understand it a little better! There are probably people much more qualified than I am to specifically answer your other questions.", "Atoms scatter X-ray waves, primarily through the atoms' electrons. X-rays hit a regular array of scattering atoms and add/subtract according to Bragg's Law equation. Check up on Von Laue's Nobel Prize in Physics in 1914.\n\n_URL_4_\n\nIf you have a good-sized University by you, their Chemistry and/or materials science department will have an X-Ray crystallographer on staff. While in grad school at UofL here in Louisville, I had the opportunity to grow, select, and mount a single crystal of one of my compounds in the X-Ray goniometer, run the diffraction experiment, analyze the photographs, plot the data, crunch the numbers, and get out a plot which perfectly matched experimental prediction ([ORTEP plot](_URL_4_)) Amazing stuff!\n\nHere's a good overview:\n\n_URL_3_" ], "score": [ 7, 3, 2 ] }
{ "url": [] }
{ "url": [ "http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/imgqua/bragglaw.gif" ] }
{ "url": [ "http://upload.wikimedia.org/wikipedia/commons/2/26/Braggs_Law.svg", "http://upload.wikimedia.org/wikipedia/commons/f/f6/Interfering_Electron_Wave_Packets_animated.gif", "http://web.ornl.gov/sci/ortep/ortep.html", "http://www.xtal.iqfr.csic.es/Cristalografia/index-en.html", "http://www.nobelprize.org/nobel_prizes/physics/laureates/1914/speedread.html" ] }
Why is Bragg's law empirically correct? (worded as a question now). In x-ray diffraction, Bragg's law states the relationship between the lattice spacing of a crystal and the wavelength and incidence angle of incident radiation to that crystal. [Bragg's Law](_URL_0_) I understand the proof of the law (it's just geometry), but I have a few question's about why it works in practice: 1. Why is the incidence angle equal to the diffraction angle? Why do photons see the diffracting planes of atoms as "planes," when the EMF around the atoms in the crystal isn't planar? 2. What properties/fields causes a diffraction event? More generally, for any interaction between a photon and any particle with mass, which fields are interacting? 3. What is the extent of the "trail" of a photon? How far ahead of one photon can another in-phase, parellel, and laterally near photon be, while still interfering with it constructively (or destructively, if out of phase)? 4. Why do powders produce clear diffraction lines? In a material with millions of randomly oriented crystals, why do clear diffraction lines at any angles exist (suggesting that the planes of randomly oriented crystals favor a specific orientation)? Sorry if this is too specific. I also don't know quite what discipline this falls under.
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l6vnp
Does using antiperspirant really make you less attractive to the opposite sex?
I've heard several people state that cutting off the apocrine sweat glands in your armpits through antiperspirant use results in a dampening of pheromones/hormonal signals/etc that are normally released to communicate to members of the opposite sex, and can thus make it more difficult to "attract" mates; is this true, or just bunk? I would imagine that massive pit stains will probably trump any hormonal advantage that sweating may give you, but I am still intensely curious whether there is any truth to the above statement. Is my antiperspirant keeping me from finding love, r/askscience?
askscience
{ "a_id": [ "c2qa45f" ], "text": [ "You have sweat glands all over your body, those things just target the worse offenders.\n\nThere is no evidence that pheromones exist in humans. Hormones are something that works internally. I don't doubt that humans have smells and might have some effect, I'm being picky." ], "score": [ 6 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Does using antiperspirant really make you less attractive to the opposite sex? I've heard several people state that cutting off the apocrine sweat glands in your armpits through antiperspirant use results in a dampening of pheromones/hormonal signals/etc that are normally released to communicate to members of the opposite sex, and can thus make it more difficult to "attract" mates; is this true, or just bunk? I would imagine that massive pit stains will probably trump any hormonal advantage that sweating may give you, but I am still intensely curious whether there is any truth to the above statement. Is my antiperspirant keeping me from finding love, r/askscience?
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2813qr
I am 20. What is the chance that I will see mylifespan increase significantly?
askscience
{ "a_id": [ "ci6ekhd" ], "text": [ "The chances that you will see your lifespan increase significantly (years or more) right now are probably best realized by making sure you make healthy and not self-destructive lifestyle choices from here on out." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
I am 20. What is the chance that I will see mylifespan increase significantly?
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3ob78e
Could something like the ionocraft (The lifter) be upscaled into a vehicle?
Going back and re-watching old episodes of MythBusters there was an episode where they tried to debunk anti-gravity devices and one such device was the lifter which was proven to generate lift by ionizing air and forcing it downwards. Could such a concept be upscaled into a vehicle of some sort? In my mind I envision something like the Osprey in design with the two Ion thrusters at the ends of the wings. Could this work or does it only work on the small scale?
askscience
{ "a_id": [ "cvvozw1" ], "text": [ "It would kind of be possible but not as you describe it. The biggest issue with electric propulsion and ion thrusters is that they need a lot of electrical energy to produce thrust. And so far we do not have light, high power electric generators. What a lot of people underestimate is how much energy is contained into a kilogram of conventional jet or rocket fuel. \n\nUnder standard gravity there is no real way for ion thruster to lift itself, the thrust to weight ratio is just not good enough. The small lifter you see on youtube are always connected to the a external power supply.\n\nHowever the same kind of idea (accelerating ions with an electric field) has been used in space for decades. The only difference is that you can't use ambient air so you have to bring your propellant gas with you. Look up gridded ion thrusters and Hall thrusters for more info. Those are highly efficient engines.\n\nNow to answer why I said it was kind of possible with a \"lifter type\" craft. There has been studies on a concept for low earth orbit satellites that would use the very thin atmosphere still present at 200~300km altitude to propel themselves. The basic idea is that they would scoop the gas and make it go through a lifter type acceleration system. The thrust would be very small but it would be enough to adjust your orbit.\n\nI hope this make sense, I just woke up. Don't hesitate if you have any other questions." ], "score": [ 3 ] }
{ "url": [] }
{ "url": [] }
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Could something like the ionocraft (The lifter) be upscaled into a vehicle? Going back and re-watching old episodes of MythBusters there was an episode where they tried to debunk anti-gravity devices and one such device was the lifter which was proven to generate lift by ionizing air and forcing it downwards. Could such a concept be upscaled into a vehicle of some sort? In my mind I envision something like the Osprey in design with the two Ion thrusters at the ends of the wings. Could this work or does it only work on the small scale?
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c3xx9m
How does antiperspirant work? How was it discovered?
askscience
{ "a_id": [ "ervp4ik", "erww11v" ], "text": [ "Typical antiperspirants work by physically blocking the secretion of sweat. Most contain certain types of aluminum salts which diffuse into the sweat gland openings and, as they react with electrolytes in sweat, form a gel that temporarily plugs the glands.", "Sharlinator explained how antiperspirants work. As for the history, it was invented by Dr. Abraham D. Murphey, who originally created the substance to help surgeons deal with sweaty hands. His daughter, Edna Murphey, made the realization that it could be applied underarm and founded Odorono in 1912." ], "score": [ 5, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
How does antiperspirant work? How was it discovered?
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al7j2o
When hamsters run on a wheel, are they aware they are not actually going anywhere?
It is clear that hamsters and other small animals enjoy running on wheels or discs, but what is their drive behind it? Are they smart enough to realize they aren't moving? Is it purely instinctive or do they just find it fun?
askscience
{ "a_id": [ "efq7fgo" ], "text": [ "From observing a lot of hamsters in my day I would say that they are just trying to get energy out. They're hyperactive little things and if they go more than a few minutes (while they're awake) without anything to do or eat, they'll get extremely stressed out and even more restless. Same could be said of most other rodents and high-metabolism animals like cats, probably.\n\nTl:dr; they're just bored, not looking to really move anywhere per se." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
When hamsters run on a wheel, are they aware they are not actually going anywhere? It is clear that hamsters and other small animals enjoy running on wheels or discs, but what is their drive behind it? Are they smart enough to realize they aren't moving? Is it purely instinctive or do they just find it fun?
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23tz8h
What compensates for the change in the momentum of an object held with optical tweezers?
I already know that optical tweezers work by refracting a laser beam into a narrow beam waist where it creates a small magnetic field. I also know that this then holds onto dielectric particles by way of that magnetic field, but what compensates for the change in the particle's momentum? I figured that the movement to the left and right might be compensated for by a change in the laser's path, but what about the forward and backward movement? Does the light change frequency?
askscience
{ "a_id": [ "ch0qzxr" ], "text": [ "Particles are attracted to the focal point due to the gradient of the electric field caused by focusing the laser light. This applies in all directions, not just sideways." ], "score": [ 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
What compensates for the change in the momentum of an object held with optical tweezers? I already know that optical tweezers work by refracting a laser beam into a narrow beam waist where it creates a small magnetic field. I also know that this then holds onto dielectric particles by way of that magnetic field, but what compensates for the change in the particle's momentum? I figured that the movement to the left and right might be compensated for by a change in the laser's path, but what about the forward and backward movement? Does the light change frequency?
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2i07bq
My wife is normally a very rational and intelligent person, but today she was freaking out. She told me she read that "They use aborted babies in some vaccines." Is there any shred of truth to this at all? I would love a peer reviewreviewed article on the topic.
Oops. Slight spelling jumble in the title there.
askscience
{ "a_id": [ "ckxormj" ], "text": [ "Several vaccines are prepared with human cell lines, and two of these cell lines were indeed derived from two fetuses that were aborted over 40 years ago, back before there were clear guidelines about use of such materials. No new fetuses are being used, and there are no fetal materials in the vaccines themselves. (That is, the vaccines are purified before use and don't have fetal cells in them or anything like that.)\n\nOne of these cell lines, known as WI-38 or CCL-75, was derived from a female fetus aborted in 1964 in the USA. The other cell line, known as MRC-5 or CCL-171, was derived from a male fetus aborted in 1970 in the UK. Both were used in an assortment of rubella vaccines and also in a few other vaccines.\n\nBTW the Vatican did a thorough review of this issue in 2005, [linked here](_URL_0_) - it's an interesting read and has a detailed list of which vaccines are involved, plus cites to peer-reviewed literature. The Vatican ended up concluding that it's ethical, from the perspective of that religion, to use these vaccines - particularly given the interesting ethical complications that (1) rubella vaccine is the most affected, and (2) rubella itself causes miscarriages in pregnant women! \n\nIn 2008 the Vatican issued a formal announcement that Catholic parents can give their kids these vaccines, but should also urge the medical establishment to shift vaccine production to other cell lines. (That's easier said than done, btw.)\n\nBoth these cell lines remain in widespread use today in all sorts of biomedical research, btw. It's reminiscent of the situation with the HeLa cell line, originally derived from Henrietta Lacks; she died of cancer and her cancer cells were taken, and sold, and used in innumerable studies, without her family's knowledge or consent." ], "score": [ 208 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.immunize.org/concerns/vaticandocument.htm" ] }
My wife is normally a very rational and intelligent person, but today she was freaking out. She told me she read that "They use aborted babies in some vaccines." Is there any shred of truth to this at all? I would love a peer reviewreviewed article on the topic. Oops. Slight spelling jumble in the title there.
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24gas6
A few questions about periodic cicadas?
Periodic cicadas species are caracterised by a given periodicity (usually a prime number such as 13 or 17). This is their defining caracteristic and the basis for their reproductive strategy of unpredictable predator saturation. Yet, several species have multiple cohorts which co-exist more or less side by side. Each cohort emerges a different year, has a distinct geographic distribution and normally they would not meet. 1 - How can multiple cohorts form within taxa with such a tightly constrained life cycle and periodicity? Do a few individuals somehow skip a year now and then? Or is the periodicity ill defined when the species is newly formed? Or something else? 2 - Can these cohorts be considered to be genetically isolated from one another and to what extent? 3 - Could each individual cohort be considered a cryptic species on the basis of its putative reproductive isolation from the others.
askscience
{ "a_id": [ "ch6yva8" ], "text": [ "1) The evolution of periodicity is still poorly understood. It is believed to begin as proto-periodicity in which a long-live species is much more abundant in some years than others (some cicada species still do this). Once this is established, selection may favor individuals who are alive in the more populous times. The advantage is assumed to be predatory satiation. If the number of predators is constant and the number of prey increases, the odds of any individual being eaten decreases which favors individuals who are alive with many other individuals.\nSometimes a group of brood (cohort) will switch it’s timing. For an unknown reason, these switches tend to be either 1 year or 4 years (with 4 being more common). \n\n2) \n > Brood within life cycles are, by definition, temporally reproductively isolated. Thus, according to the biological species concept, broods would qualify as good species while 13- versus 17-year forms of the three morphologically distinct species, which have the opportunity to mate every 221 years, would not. However, lack of morphological and genetic differentiation among broods and the practical problem of naming so many different entities argues against such a designation.\n\nSo genetic isolation can be argued but there doesn't seem to be a large genetic difference between broods (or cohorts).\n\n3) They’re unlikely to be considered cryptic species since there isn’t a great deal of genetic difference between them. Some scientist do not even consider the 13-year and 17-year cicadas to be different species. Remember that species is not as firmly defined as most people tend to believe.\n\nSource: [This 1995 review article]( _URL_0_)" ], "score": [ 7 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://hydrodictyon.eeb.uconn.edu/projects/cicada/resources/reprints/Williams%26Simon_1995.pdf" ] }
A few questions about periodic cicadas? Periodic cicadas species are caracterised by a given periodicity (usually a prime number such as 13 or 17). This is their defining caracteristic and the basis for their reproductive strategy of unpredictable predator saturation. Yet, several species have multiple cohorts which co-exist more or less side by side. Each cohort emerges a different year, has a distinct geographic distribution and normally they would not meet. 1 - How can multiple cohorts form within taxa with such a tightly constrained life cycle and periodicity? Do a few individuals somehow skip a year now and then? Or is the periodicity ill defined when the species is newly formed? Or something else? 2 - Can these cohorts be considered to be genetically isolated from one another and to what extent? 3 - Could each individual cohort be considered a cryptic species on the basis of its putative reproductive isolation from the others.
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wrc5t
Found this butterfly in Kalimantan (Borneo), Indonesia. Is this a rare species?
_URL_0_ Specifically in the city of Berau.
askscience
{ "a_id": [ "c5fraom" ], "text": [ "/r/whatsthisbug would be able to help you out." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [ "http://imgur.com/agVj3" ] }
{ "url": [] }
Found this butterfly in Kalimantan (Borneo), Indonesia. Is this a rare species? _URL_0_ Specifically in the city of Berau.
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z8nnu
What would a macroscopic sheet of layered cellular membranes feel like?
What color would it be? Would it be translucent? Would it tear or pop like a bubble? What if it was stitched together with transmembrane proteins or microtubules? How would cholesterol affect the appearance, texture and strength? If I had a button-sized transmembrane protein, would it be fixed in place, or could I move it around? What would happen if I ate a pound of membrane? What if I scraped some epidermis off and laid down a sheet of membrane? Would a handful of ribosomes be powdery, crumbly, or like egg white? What would DNA fabric be like with and without histones? How about microtubule fabric? Is hemoglobin red in the middle or red all over? Are there any lesser known colorful biochemicals?
askscience
{ "a_id": [ "c637fr6" ], "text": [ "DNA would be sticky since it's got a very large molecular weight. Same with ribosmones and proteins. You really couldn't have a handful, they need to be at the right concentrations of H2O and H+, but it would be adhesive.\n\nCellular membranes would be like some sort of emulsified fat mixture.\n\nTransmembrane receptors are malleable and can assume a few different states in response to different ligands bonding.\n\nThink of proteins as a bunch of different strength magnents on a string. There's only a few configurations that are stable for it, so they fold themselves." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
What would a macroscopic sheet of layered cellular membranes feel like? What color would it be? Would it be translucent? Would it tear or pop like a bubble? What if it was stitched together with transmembrane proteins or microtubules? How would cholesterol affect the appearance, texture and strength? If I had a button-sized transmembrane protein, would it be fixed in place, or could I move it around? What would happen if I ate a pound of membrane? What if I scraped some epidermis off and laid down a sheet of membrane? Would a handful of ribosomes be powdery, crumbly, or like egg white? What would DNA fabric be like with and without histones? How about microtubule fabric? Is hemoglobin red in the middle or red all over? Are there any lesser known colorful biochemicals?
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1oadr5
Why is the Lagrangian such a special quantity?
Why is T - V so special. I understand why you would want the Hamiltonian, it is total energy. But where does the Lagrangian come from?
askscience
{ "a_id": [ "ccq8908", "ccq8tvd", "ccq8eun", "ccqbk2d", "ccq8bgc", "ccq8cue", "ccq8gr5", "ccqhsmb", "ccqalp4", "ccqalpg" ], "text": [ "The Lagrangian and Hamiltonian differ only by a Legendre transformation. If you have one there is a straight forward way to get the other, so in a sense the encode the same information but are just two different ways of looking at it.\n\nWhile the Hamiltonian is important because it gives you the total energy of the system, as you mentioned, the Lagrangian is nice because it allows you to define the \"action\" (which is the time integral of the Lagrangian). The action allows us to obtain the equations of motion of a system (namely by requiring that the variation of the action with respect to the path through phase space goes to zero).\n\nYou can also get the equations of motion straight from the Hamiltonian if you like (there are twice as many of them, but they have the benefit of being first order in time).", "I wondered about that question for several years. Finally I found couple of derivations which satisfied me.\n \nThis wikipedia page has a derivation using Newtons laws and D'Alembert's principle which are relatively basic.\n \n_URL_0_\n \n(Click on the \"show\" link).", "I wrote a short (unpublished) paper on this subject about six months ago:\n\n_URL_1_\n\nIt's still a work-in-progress but it explains how L is just a clever change of variable and not really as profound as people make it out to be.", "u/DillonWasHere gave a good answer to your question: The Lagrangian is no more special than the Hamiltonian. They contain the same \"information\". However, I would like to elaborate on why the Lagrangian (or equivalently the Hamiltonian) plays such an important role in modern physics. I can think of three reasons right now but there are probably more.\n\nThe first reason is that the Lagrangian formalism in classical mechanics is much more powerful than using Newton's laws. If you ever studied classical mechanics, you will have noticed that it is much easier to write down the Lagrangian for a complicated setup than writing down the equations of motion directly from Newton's laws. Furthermore, the Lagrangian formalism allows one to make some general statements without having to specify any details about the system that you are dealing with. For this reason, the principle of stationary action is usually considered a postulate of classical mechanics while Newton's equations are just a consequence. \n\nThe second reason is physically motivated. The principle of least action can be thought of as a consequence of the path integral formalism of quantum mechanics. It turns out that the probability amplitude (which is related to the probability) for some particle to go from A to B is given by a sum over all possible paths from A to B. The classical limit is obtained by considering the most probable path, which happens to be the one along which the action is stationary. The reason for this is that adjacent paths can interfer with each other and this interference is constructive only where the action does not change much.\n\nFinally, the principle of least action finds application in many other areas of physics. In particular, constructing a quantum field theory basically just consists of writing down some Lagrangian that satisfies certain symmetries. (Deriving results from this is the hard part.) This is not really physically motivated apart from the fact that it works. And it does so incredibly well.\n\nI hope that this makes sense. If you want to find out more about Lagrangians and Hamiltonians in classical mechanics, you should have a look at \"Introduction to Classical Mechanics\" by David Morin. It is an undergraduate level text but does a nice jobs introducing the Lagrangian formalism. If you are looking for something more advanced, take a look at \"Mechanics\" by Landau & Lifshitz. It is the most insightful treatment of classical mechanics that I am aware of. For a gentle introduction to the idea of path integrals, have a look at Feynman's book \"QED\".", "In my experience the Lagrangian is almost always used in conjunction with the action S, and its primary function is the least action principle. The Lagrangian is simply a mathematical construct that is useful to define the action S. S is a quantity that is extremely useful and a bit more intuitive in the sense that it measures the path or (speaking in very simplified terms) the work performed by the system. Because the least action principle is an accurate description of the behavior of classical systems, the Lagrangian often comes into play simply as something that must be calculated to find the equations of motion.", "Basically, the Lagrangian contains all the information about a system that is required to determine its equations of motion.\n\nIt's closely tied to [Hamilton's principle](_URL_3_) which boils down to a mathematical description of the principle of least action.\n\nThe [Euler-Lagrange equation](_URL_2_) is a differential equation whose solutions solve Hamilton's principle for a given Lagrangian.", "Pick any possible path that a particle can take, and add up the Lagrangian at each point as you go along the path (i.e. take a line integral). This gives you a number called the *action*.\n\nOut of all of these possible paths, the particle will take the path that has the smallest action!", "The fact that minimizing T-V gives you the EOM of the system, indicates that the universe has no preference for storing energy as T or V. \n\nThe universe tries to distribute energy between T and V with *minimal difference between the two*. Like two buckets connected by a siphon with water trying to seek the same level in both. There is no bias, the energy merely tries to redistribute itself between the kinetic and potential buckets evenly, subject to outside constraints (the Lagrange multipliers and Equations of Constraint).\n\nDepending on the state of the system and the effects of the constraints at a particular time, energy may be sloshing from the T bucket to the V bucket, or back from the V bucket to the T bucket, trying to \"level out.\"\n\nVery simple concept. Not so easy to write down. But, let me offer this:\n\nFor your system, you typically have multiple degrees of freedom. Energy is distributed among them. In the simple case of particle motion, you have varying amounts of kinetic and potential energy associated with different coordinate directions (x,y,z or r,theta,phi, or whatever you choose, that's the virtue of the Lagrangian, flexible choice of coordinates) of motion.\n\nA Lagrangian representation is a collection of many equations, one for each coordinate. You can assemble those equations into a matrix form. Here's a simple 2D example.\n\n1/2 mv_x**2 - 1/2 kx**2 = 0\n\n1/2 mv_y**2 - 1/2 ky**2 = 0\n\nHere's the matrix form.\n[x y v_x v_y] [[K,0],[0,M]] [x y v_x v_y]^T = 0 where ^T is transpose to make that last one a column vector.\n\nThe matrix [[K,0],[0,M]], written out longhand looks like...\n\n1/2k 0 0 0\n\n0 1/2k 0 0\n\n0 0 1/2m 0 \n\n0 0 0 1/2m \n\nThis matrix tells us a few things. It has 4 pivots, so it is full rank. k and m are positive, and if we perform the eigenvalue decomposition on this matrix, we will see that it has real, positive eigenvalues that are greater than zero.\n\nThese facts together tell us the matrix is \"positive definite.\"\n\nWhat this means is that this matrix represents a set of geometric entities (lines, surfaces, or whatever) in some higher-dimensional space that intersect in such a way that they form a well behaved extremum. A higher-dimensional \"bowl.\" Of course, the potential I chose is radial, but I'm talking about the state space of the system, the higher-dimensional *state space* of coordinates of x, v_x, y, v_y that satisfy the matrix equation, not just the configuration space.\n\nThe power of the Lagrangian is that it does not examine the system's particulars at one point in time in configuration space, it examines the shape of this state-space bowl, and asserts that the state of the system will be found at the extremum, the bottom of the bowl, where T-V is minimized. You can imagine that as the energy sloshes between T and V in the x and y directions, the point in the state space that represents the system is sliding around on the surface of that bowl, trying to work its way to the minimization point of T-V at the bottom of the bowl.\n\nIf I had written a different system, I might not have a matrix that represents a bowl, I might have a sloping surface with no clearly defined extremum, or I may have a \"saddle\" that has a stable extremum along one coordinate direction, but not another. I'm sure some clever people on this thread could suggest modifications that would keep the spring-force potential radial, but turn the shape of the state-space surface into something very different. Like external force fields or such.\n\nWhen I insert equations of constraint (external forces), I am quite literally inserting a higher dimensional geometric entity (as a term in the matrix equations) that will prevent the system from reaching the minimum of the state-space bowl. Imagine inserting a plane diagonally through the bowl, and the system now cannot reach the bottom, but instead settles down somewhere along the intersection of the canted plane and the bowl's wall. The Lagrange multiplier on that term has a magnitude equal to the force that must be exerted along the appropriate coordinate to hold the system in place in state space, and it points along the gradient of the state-space bowl away from the minumum.\n\nAnyway, that's kind of the Zen of the Lagrange formulation. Grad F = lambda G where F is your T-V and G are your constraints. At least I hope I'm remembering it all right.", "The Lagrangian simply summarises the dynamics of a system. One might ask why not simply use the Hamiltonian as a starting point? The main reason why you start with an action integral (say I = int(L.dt) Where L is the Lagrangian) is it is not simple to formulate the conditions for a theory to be relativistic in terms of the Hamiltonian.\n\nWhen one uses the action integral approach it becomes much easier; as all you require is the action integral be invariant. They will automatically lead to equations of motion which agree with relativistic principles and any developments from the chosen action integral will therefore be in agreement with relativity.\n\nPut simply, the Lagrangian is important as it makes describing a physical system using mathematics more simple.", "> But where does the Lagrangian come from?\n\nUndergrad here, so take this as you will, but (in classical mechanics) T-V basically comes from taking the D'Alembert principle, transforming it to generalized coordinates and assuming a conservative system. \nIn effect it's a purely mathematical transformation of Newton's equations.\n\nHowever, since forces seem to transform relatively neatly into energies, I guess there is a bigger underlying principle to it." ], "score": [ 91, 59, 34, 15, 8, 7, 6, 3, 2, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Lagrangian_mechanics#Newton.27s_laws", "http://www.ph.utexas.edu/~mwguthrie/t.lagrangian.pdf", "http://en.wikipedia.org/wiki/Euler%E2%80%93Lagrange_equation", "http://en.wikipedia.org/wiki/Hamilton%27s_principle" ] }
Why is the Lagrangian such a special quantity? Why is T - V so special. I understand why you would want the Hamiltonian, it is total energy. But where does the Lagrangian come from?
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y1bzy
Can one create a hierarchy of electrical conductivity?
First, I will say that I am a first time poster in /r/askscience, so if this post doesn't belong here, I apologize. I was wondering if it would be at all possible to create a list of common metals and compounds in order of their electrical conductivity? If so, what units are used to measure electrical conductivity? Again, I apologize if this post does not belong here. If it doesn't please let me know where it would, as I need this question answered. Thank you /r/askscience! EDIT: big mistake; not ALL metals.
askscience
{ "a_id": [ "c5rffuj" ], "text": [ "[Here](_URL_0_) is a standard list of commonly used conductors.\n\nAdditionally, it's not always as simple as just being a conductor or an insulator. **Semi-conductors** are complex/mixed compounds who's conductivity can change under certain conditions. \n\n**Siemens per meter** is the unit of electrical conductivity." ], "score": [ 4 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.eddy-current.com/condres.htm" ] }
Can one create a hierarchy of electrical conductivity? First, I will say that I am a first time poster in /r/askscience, so if this post doesn't belong here, I apologize. I was wondering if it would be at all possible to create a list of common metals and compounds in order of their electrical conductivity? If so, what units are used to measure electrical conductivity? Again, I apologize if this post does not belong here. If it doesn't please let me know where it would, as I need this question answered. Thank you /r/askscience! EDIT: big mistake; not ALL metals.
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3v0rx5
What should I include in my daughters science kit?
[removed]
askscience
{ "a_id": [ "cxjbaxi", "cxjdn9h" ], "text": [ "Always a pleasure to see efforts to forster early interests in science.\n\nIf you want to have an Earth Science section in there: \n\n* A good small 10x handlens, \n* A magnet,\n* a porcelain piece (for streaks)\n* Mohs hardness references (Steel nail, calcite, glass or quartz, soapstone)\n* A few reference minerals (Calcite, dolomite, mica, feldspar, Quartz, magnetite, hematite, pyroxene, hornblende, pyrite and whatever else you can get your hands on.\n* a field guide to rocks and minerals\n* a geological map/guide of your state/province/county", "I love this question so much! Vicariously excited for your daughter. :D\n\nGlad to hear she's got a good slide microscope - that takes care of seeing really small things (pond water and soil samples provide pretty much endless exploration). However, it's a bit of work preparing slides, and there are lots of things in the mid-size range - flowers, rocks, and especially bugs - that are *amazing* up close, but are too large (or too opaque) to go on a slide.\n\nSo here's my suggestion: **get her a good loupe**. [This design](_URL_0_) is best - sturdy, easy to put on a string around your neck, and you can get a good one for about 20 bucks. I carry mine with me everywhere, and it's lasted me seven years so far. One of my most prized possessions.\n\n[Mine's a 10x](_URL_1_). Higher magnifications are good to have, but I consider them an optional bonus - 10x is high enough to reveal astounding amounts of detail you had no idea were there, but not high enough to be disorienting.\n\nIf she likes it, get her a [stereo microscope](_URL_2_) and some petri dishes next Christmas. Then she can *really* look at bugs." ], "score": [ 6, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "https://upload.wikimedia.org/wikipedia/commons/4/4e/Loupe-triplet-30x-0a.jpg", "http://image.rakuten.co.jp/w-riv/cabinet/m-loupe-10bai.jpg", "https://en.wikipedia.org/wiki/Stereo_microscope" ] }
What should I include in my daughters science kit? [removed]
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uhk9o
How long will the faces, etc. on Mount Rushmore last (assuming no human intervention)?
A few years back the feature known as [The Old Man of the Mountain](_URL_0_) in New Hampshire collapsed. A conversation about this with some kids over the past weekend brought the topic to mind. The question assumes normal/commonly predictable weather patterns. I am also thinking of the reactions of archaeologists at different times (5k years, 10 kyears, etc) in the future, given this and other mountain carvings around the country.
askscience
{ "a_id": [ "c4vicnk" ], "text": [ "According to wikipedia, the granite that was carved for Mt Rushmore erodes at only 1 inch every 10,000 years. \n\nThe noses are 20 feet long, but I couldn't find a depth measurement. Somebody will have to take the math from here to figure out when the faces will become unrecognizable." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Old_Man_of_the_Mountain" ] }
{ "url": [] }
How long will the faces, etc. on Mount Rushmore last (assuming no human intervention)? A few years back the feature known as [The Old Man of the Mountain](_URL_0_) in New Hampshire collapsed. A conversation about this with some kids over the past weekend brought the topic to mind. The question assumes normal/commonly predictable weather patterns. I am also thinking of the reactions of archaeologists at different times (5k years, 10 kyears, etc) in the future, given this and other mountain carvings around the country.
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wm8bj
At what age does the prefrontal corext finish maturing?
I know when I was younger I was always told that it finished at the age of 21 but I remember hearing about a study that said that it was closer to 25. Could someone please provide me a good source for the actual age of maturation?
askscience
{ "a_id": [ "c5ej11c" ], "text": [ "In medicine, I've seen it stated anywhere from 18-25. Truth be told, it differs from person to person and between sexes. Also, neuronal development/migration is dependent upon nutrient rich vs nutrient poor environments as well. Different sources will claim different ages." ], "score": [ 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
At what age does the prefrontal corext finish maturing? I know when I was younger I was always told that it finished at the age of 21 but I remember hearing about a study that said that it was closer to 25. Could someone please provide me a good source for the actual age of maturation?
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w2wl6
LHC and time travel
askscience
{ "a_id": [ "c59r4sq" ], "text": [ "[Searched](_URL_1_)\n\nRelevant [discussion](_URL_3_)\n\nOriginal question by [Bradical123](_URL_2_)\n\n > I mean they're traveling 99.999999etc% the speed of light. Isn't that what has to happen to time travel?\n\n > EDIT: by particle accelerator I was talking about the LHC or any capable of moving particles that fast..\n\nTop comment courtesy [Sleekery](_URL_0_)\n\n > They don't time travel. Their time, relative to ours, just really slows down according to the [time dilation formula](_URL_4_). For example, if the particle was going at 0.99c, 1 second in the particle's frame would take 7 seconds in our frame. Make it 0.999c, and that 1 second in the particle's frame would appear to us to take 22 seconds.\n\n > A possible interpretation of this formula is that, if one could happen to go faster than the speed of light (impossible according to special relativity), one could time travel. However, particles cannot do that (unless our understanding of physics is wrong)." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.reddit.com/user/Sleekery", "http://www.reddit.com/r/askscience/search?q=lhc+time+travel&amp;restrict_sr=on", "http://www.reddit.com/user/Bradical123", "http://www.reddit.com/r/askscience/comments/lw32o/do_the_particles_in_the_particle_accelerator_time/", "http://www.wolframalpha.com/input/?i=time+dilation+formula" ] }
LHC and time travel
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1sbxa4
Which flow type cools faster, Laminar or Turbulent?
If a copper rod is being cooled by a fan, and depending on its position it can experience both turbulent or Laminar flow, would the rod cool faster if the flow is more turbulent or laminar? The position the rod experiences laminar is closest to the cooling source, so intuitively this would cool faster, but experiment has shown that the further away from the source it is, and the more turbulent the flow, the faster it cools. Am I misunderstanding my results, or what is going on behind the physics?
askscience
{ "a_id": [ "cdw21i6" ], "text": [ "Laminar flow provides heat transfer only through conduction because in laminar flow the air is flowing in sheets with little mixing between them. A way to visualize this is a deck of playing cards. The layer of air that touches the rod is heated. That layer also does not mix with the other layers of air above it. The heat can only be transferred from one layer to the next by contact (conduction). Since the energy transfer rate depends on the temperature difference, the sheet of air gets warmer by the end of the rod and is removing heat at a slower rate than when it first began conducting heat from the rod. The turbulent flow has no sheets. This means that more fresh cold gas will contact the surface resulting in a faster heat transfer rate due to a larger average temperature difference between the rod and air." ], "score": [ 5 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Which flow type cools faster, Laminar or Turbulent? If a copper rod is being cooled by a fan, and depending on its position it can experience both turbulent or Laminar flow, would the rod cool faster if the flow is more turbulent or laminar? The position the rod experiences laminar is closest to the cooling source, so intuitively this would cool faster, but experiment has shown that the further away from the source it is, and the more turbulent the flow, the faster it cools. Am I misunderstanding my results, or what is going on behind the physics?
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r6hn9
How do you calculate the energy used to hold something in the air?
My big problem here is that obviously W=Fd doesn't work here. I understand that if some force were acting on the object it wouldn't generate any work since the object is stationary, but I'm talking about the specific situation where the object is a helicopter or something else of the kind, where you're using momentum to hold it up.
askscience
{ "a_id": [ "c43ahff", "c43etc1", "c43eafd", "c43dfng" ], "text": [ "I think that's a pretty common mental hurdle to go through- I had the same problem. You already know that W = F*d, so you know that W is not equal to F. Maybe you have to take a while to intuitively understand that.\n\nThe scenario of objects using energy to hold things up is because air is not a solid mountain that can be climbed. On a mountain, the rigidity of the mountain keeps you there. Your legs exert the force to support your torso, but if you're not moving the force multiplied by zero displacement mean no additional work done to hold you.\n\nA helicopter holds itself aloft by pushing air down with its rotors. However, the high pressure region under the rotors will not persist for long- without a container to hold the high pressure air in place, it quickly dissipates and the air moves away. So to keep in place a high pressure region directly under the rotors, the rotors have to keep turning, thus resulting in the f*d > 0.\n\nFor the helicopter body, F = constant, and since it's not moving, d=0. So work on the body is zero. So where did the energy go? It went to the air. The air moving downwards had kinetic energy, and when the air flows around and frictions slows that motion down, it ends up as heat in the air.", "Before I started typing this out I thought I knew the answer, but now I'm pretty sure I did something wrong. Here's what I have, maybe it will help or someone will know what I did wrong.\n\nA helicopter stays up by pushing air down. You have to look at the mass flow rate of the air it pushes down, and that air's mean velocity. I'm going to pull some numbers out of my ass now for the sake of science, and say that the mass of a helicopter is 1,000 kg. The amount of force pulling it down is equal to m∙g, 9,800 kg∙m /s^2 . Lets say that 100 kg of air is pulled through the rotor every second. If we divide 9,800 kg∙m/s^2 by 100 kg/s, we get 98 m/s, which is the required mean velocity of the air.\n\nSince the air was initially static (v=0), the change in kinetic energy is 1/2mv^2 , (.5)(100)(98^2 )=480,200 J. Since the mass used was actually 100 mg/**s**, this means that we get a quantity of 480,200 J/s, or 480.2 kW.\n\nAssumptions: Velocity everywhere is equal to the mean velocity. The air is only being pushed down, not rotated.\n\n**Why this is wrong:** If I were to pick a different mass flow rate, I would get a different answer. If my rotors were infinitely large, and could pull an infinite amount of air through them with an infinitesimal velocity, the power required would be zero.", "The best way to think about it is to think of a free body diagram. ALL objects on earth are subject to a constant acceleration of 9.81m/s^2 towards the center of the earth (gravity).\nForce is defined as mass x acceleration, therefore any object with mass always experiences this force. \nThe same is true for an object in suspension such as a piano being lifted by a helicopter. The helicopter, say 1000kg, is subject to a gravitational force of 9810 newtons. As such, to hold it stationary, the helicopter must exert and equal and opposite force, that is, 9810N upwards. By the laws of physics, this helicopter is not technically doing any work at all until there is some vertical displacement of the piano. When no movement is involved this is an area called Statics (study of forces applied to immobile objects). \nI know thats not a direct answer to your question, and is similar to unhedged's answer, but i figured another explanation couldn't hurt. He/She is correct in that the energy used to keep the helicopter in flight is transferred largely to the motion of the air, and some is dissipated as sound and heat as well.", "For an object to remain stationary, all forces must be in equilibrium. A flying object must counteract the force of gravity drawing it downward.\n\nA ballon/blimp uses buoyancy. The force of buoyancy is enough to keep the object in the air. No additional energy input is required.\n\nA helicopter rotor propels air downward. The rate of momentum gained by the air (downward) is equivalent to the rate of momentum gained by the helicopter (upward). The energy expenditure is based on how much energy must be burned in the motor to generate a downward shaft of air to keep the helicopter suspended. \n\nAn aircraft generates lift. This is a static process, so the plane isn't losing much energy generating the lift. However, lift is based on velocity so the plane must overcome the drag of the air to continue flying." ], "score": [ 3, 2, 2, 2 ] }
{ "url": [] }
{ "url": [] }
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How do you calculate the energy used to hold something in the air? My big problem here is that obviously W=Fd doesn't work here. I understand that if some force were acting on the object it wouldn't generate any work since the object is stationary, but I'm talking about the specific situation where the object is a helicopter or something else of the kind, where you're using momentum to hold it up.
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2fuj02
Why are narwhal tusks always twisted counter-clockwise?
askscience
{ "a_id": [ "ckdmbet" ], "text": [ "At first I thought this was going to be due to the fact that the vast majority of narwhals only retain the left tusk, but [this two-tusked specimen](_URL_0_) clearly shows both twisting the same direction, so I did some hunting. [This paper](_URL_2_) (paywall warning) suggests that the entire skulls and airways of many/all whale species have been selected to minimize the risk of food or seawater entering the lungs. The result of this selection is that the larynx is not in the middle of the throat and many bony structures are shifted to accomplish this - [this diagram of a fossilized dolphin ancestor](_URL_1_) shows it pretty well. Given the altered development of the skull, the non-mirror image development and asymmetrical tusk loss could result from a shift in a midline signal like [sonic hedgehog](_URL_3_)" ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/File:Narwalschaedel.jpg", "http://www.nature.com/nature/journal/v508/n7496/images_supplementary/nature13086-sf4.jpg", "http://onlinelibrary.wiley.com/doi/10.1002/ar.20539/pdf", "http://en.wikipedia.org/wiki/Hedgehog_signaling_pathway" ] }
Why are narwhal tusks always twisted counter-clockwise?
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lh1qm
Can somebody explain the Feynman Sprinkler?
I'm in a high school mechanics course, and we're discussing Newton's Laws. I had read online about the Feynman Sprinkler (a sprinkler-like device submerged in water and made to suck in the surrounding fluid) but have trouble understanding why it doesn't just stand still.
askscience
{ "a_id": [ "c2so5eu" ], "text": [ "Insight: In extremely viscous fluid, if fluid is blown from a straw, it expands in all directions like nested expanding spheres. It looks just like the sucking/intake pattern, except flowing backwards instead of contracting nested spheres.\n\nAnd in non-viscous (inviscid) fluids, if fluid is sucked into a straw, it's drawn from all directions, same as with viscous fluid. It acts like nested contracting spheres with the intake at the center. But if inviscid fluid is blown from a straw, it exits the straw as a narrow jet which carries significant momentum. No expanding nested spheres of fluid. (Also the edge of the straw emits a thin cylinder of \"vorticity\" where the jet meets the surrounding air. This is missing during sucking.) \n\nSucking is not like blowing. You can blow out a distant candle, but you can't suck it out unless your lips are very close to the flame. A rocket engine can produce thrust by boiling a liquid and flinging out vapor, but it cannot produce equivalent backwards thrust by sucking in a gas and compressing it into stored liquid. Low-viscosity fluids don't have time-reversible flows! Blowing creates vorticity. The movie film doesn't work right when played backwards. Ugh, entropy.\n\nWith the rotary sprinkler in suction mode, does the fluid go in, then merge at the center of the arms, then *keep spinning* as it exits the center and out into the hose? Is there a little tornado exiting from the center unmoving pipe? If so, then the sprinkler must experience torque and spin the other way to conserve rot momentum, although this torque might be feeble. The design of the center chamber could produce CW or CCW pipe-tornadoes depending on whether the fluid enters the center tangentially, and thus determine which way the sprinkler turns.\n\n\nBut perhaps something also happens out at the intakes at the ends of the arms. If any of the entrained flow is thrown off the arms and away into the distance, and doesn't get sucked into their tips, and if this flow has an overall spin, then the sprinkler would be forced to rotate the other way. When rotating, perhaps the inward flow is accidentally flinging off some regions of vorticity and some narrow fluid jets!\n\n--\n\nThen in jet mode, when the fluid is ejected from the tips, does the fluid have an overall spinning motion? Yep, quite large. The jets are tangential. So obviously the sprinkler must experience a large torque in the opposite direction and spin very rapidly. There won't be a tornado coming up the feed pipe, so that's no issue. Blowing is totally different than sucking.\n\nLast: what will the Feynmans of the future be playing with, since this one is already known? And airfoil lift is just about mined out? But there are still mysteries which can be used to upset the experts. How about Abyssal benthic storms, lahars, Mars global sandstorms, and pyroclastic surges? These aren't well understood. Perhaps they're all the same? Build a miniature one and poke at it. With luck, everyone will spend decades arguing about it." ], "score": [ 5 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Can somebody explain the Feynman Sprinkler? I'm in a high school mechanics course, and we're discussing Newton's Laws. I had read online about the Feynman Sprinkler (a sprinkler-like device submerged in water and made to suck in the surrounding fluid) but have trouble understanding why it doesn't just stand still.
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1kwl3t
If I pushed a rod that was one light year long, would a person at the other end of the rod see it move at the same time I pushed the rod?
askscience
{ "a_id": [ "cbtc1tp", "cbtc3rv" ], "text": [ "The push will propogate at the speed of sound in the rod, which is (for a real rod) less than the speed of light.", "A normal push is basically a sound wave and therefore bound to the speed of sound in the material.\n\nA shockwave can travel faster, but still far slower than c." ], "score": [ 3, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
If I pushed a rod that was one light year long, would a person at the other end of the rod see it move at the same time I pushed the rod?
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1r734s
What is the most accurate measurement?
Hello askscience, I am a chemistry undergrad in an analytical/instrumental chem course, and just learned about one of my professor's research topics that is a method with detection limits theoretically in the parts per quadrillion, which got me thinking. I was wondering: what is the most accurate measurement technique out there? In terms of detection limit, or measurement uncertainty, or whatever. I realize that I'm asking a question that could be taken several ways, as you can have accuracy in looking for a concentration, a distance, or a whole host of other things, but I feel like it would be really cool to hear about things from a variety of fields. Thanks all!
askscience
{ "a_id": [ "cdk98m9" ], "text": [ "The quantity that is often cited as being the best measured is the magnetic moment of an electron (related to how an electron responds to magnetic fields). It is very close to two, and half the deviation from 2 has been measured as 0.00115965218073(28), where the brackets indicate uncertainty on the final digits. This means the magnetic moment has been measured to a part per trillion.\n\nThe theoretical value, based on quantum electrodynamics, is .001159652180{85(76)}, where I put curly brackets where it deviates from the experiment (within the uncertainties). This is the most accurate verified prediction in science." ], "score": [ 6 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
What is the most accurate measurement? Hello askscience, I am a chemistry undergrad in an analytical/instrumental chem course, and just learned about one of my professor's research topics that is a method with detection limits theoretically in the parts per quadrillion, which got me thinking. I was wondering: what is the most accurate measurement technique out there? In terms of detection limit, or measurement uncertainty, or whatever. I realize that I'm asking a question that could be taken several ways, as you can have accuracy in looking for a concentration, a distance, or a whole host of other things, but I feel like it would be really cool to hear about things from a variety of fields. Thanks all!
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291yat
What would happen if you held a plumb bob/line directly at earth's center?
askscience
{ "a_id": [ "cigmu8i", "cigr6z5" ], "text": [ "There's no net force of gravity at the center of the earth, so it would float freely, just as it would in space. More generally, for a spherically symmetric mass (which the earth is *very* nearly), the only force you'll feel at any location is the force of all the mass closer than you to the center. All of the mass farther than you from the center will cancel out, producing no net force. As you get closer to the center, the total mass closer than you decreases, so the net force decreases as well, until it reaches zero at the very center.", "Also importantly, you would die. The Earth's core is not some big cavern, as occasionally depicted. It's a mass of superheated iron and other heavy elements, under such immense pressure that it remains solid despite the heat." ], "score": [ 17, 4 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
What would happen if you held a plumb bob/line directly at earth's center?
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mmisn
How can we prove that the blue I see, is the same blue you see and not the red I see (or any other color I see) to you?
How do I know we are seeing the same colors since your blue may be my red? And if we can't prove it, do you think it is occurring?
askscience
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{ "url": [ "http://www.reddit.com/r/askscience/comments/lwvep/how_can_we_be_sure_that_the_color_im_seeing_is/", "http://www.reddit.com/r/askscience/comments/gunx5/seeing_colors_is_your_red_the_same_as_my_red/", "http://www.reddit.com/r/askscience/comments/mfvnf/is_it_possible_that_when_you_see_a_certain_color/", "http://www.reddit.com/r/askscience/comments/lxyoe/is_it_possible_to_prove_the_red_i_see_is_the_same/" ] }
How can we prove that the blue I see, is the same blue you see and not the red I see (or any other color I see) to you? How do I know we are seeing the same colors since your blue may be my red? And if we can't prove it, do you think it is occurring?
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pej3n
Are these some intelligent formulas or just gibberish? (from the amazing spider-man - official trailer) XPOST from chemistry
_URL_0_
askscience
{ "a_id": [ "c3oqhce" ], "text": [ "I don't see anything that makes it seem like obvious gibberish. \n\n\nThe function is denoted with phi (the \"O\" with a superimposed \"I\") and is defined at the bottom. It is slightly fishy that the function's independent variable(s) are not listed (as in phi(x) or phi(t)), but this isn't necessarily proof either way. \n\n\nThis function contains a summation (the sign that looks like an \"E\") over all i, and a product (the symbol most people know as Pi) over all j. Admittedly, just writing the j or i underneath these is a bit of a shorthand, but not wrong. \"i\" and \"j\" seems legit in the visible part of the formula.\nThen there's a log, but the rest you obviously can't see.\n\n\nNow at the top, it seems like the log of this function is then differentiated with respect to t. This is not uncommon at all. In any case, without seeing the full function, I can't say for sure.\n\n\nIt even surprises me, but I'd probably bet that it isn't gibberish, as it seems quite improbable to have a fairly large part of the visible mathematics contain no obvious flaws, and the obscured part to be a child's doodle. I would however be quite surprised if it actually pertains to the topic they are discussing at that moment.\n\n < edit: spelling and some more speculation below > \n\nIt is also common to find the function itself in its derivative when logs are present, as y'(t) = 1/t for y=log(t)." ], "score": [ 3 ] }
{ "url": [] }
{ "url": [ "http://imgur.com/a/yqNiO" ] }
{ "url": [] }
Are these some intelligent formulas or just gibberish? (from the amazing spider-man - official trailer) XPOST from chemistry _URL_0_
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v7zkz
Are humans naturally predators, prey or scavengers?
I have a feeling that the answer here will be complex, but here is why I ask. When I studied anthropology, I was told that bipedalism likely came about in the African savannah, as we learned to get our heads up to avoid being preyed upon. We know that predatory animals, such as tigers, will target humans. My understanding is that predators will avoid preying on other predators (though they might fight for territory). Yet, we also learn that we evolved traits that helped us in hunting, such as dextorous hands for creating and throwing weapons. Recently, I have seen evidence that many human groups scared predatory animals, such as lions and tigers, away from their prey to grab pieces of the kill. I don't know if it makes sense to categorize humans in this way.
askscience
{ "a_id": [ "c52523r", "c524nen" ], "text": [ "We are naturally all of the above, with the qualification that humans don't really have the digestive equipment to scavenge long-dead corpses. But they certainly would have scavenged or stolen fairly fresh kills. Humans also hunted their own prey, and were hunted by predators. We also ate plenty of plants. \n\nAnyway, this is not as unusual as you might think. While it is commonly believed that predators don't eat other predators, in fact it's not all that uncommon. Predators don't generally rely on other predators for the majority of their diet, because herbivores are so much more common, but they will still hunt other, smaller predators if the opportunity presents itself. Nearly all predators also scavenge food as well as hunt it. For instance, lions and hyenas both are known to hunt and to scavenge.", "Prior to farming became a widespread cultural habit humans spent a long period of time as endurance hunters, we have intelligence, opposed thumbs, and a surprising ability to just keep going and going at a steady rate. \n \nIn a world where many animals preyed upon by humans were larger and massed more, or smaller lighter and faster, humans were very good at making flint weapons that could pierce and badly injure and then consistently track and harass prey until it collapsed from exhaustion." ], "score": [ 6, 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Are humans naturally predators, prey or scavengers? I have a feeling that the answer here will be complex, but here is why I ask. When I studied anthropology, I was told that bipedalism likely came about in the African savannah, as we learned to get our heads up to avoid being preyed upon. We know that predatory animals, such as tigers, will target humans. My understanding is that predators will avoid preying on other predators (though they might fight for territory). Yet, we also learn that we evolved traits that helped us in hunting, such as dextorous hands for creating and throwing weapons. Recently, I have seen evidence that many human groups scared predatory animals, such as lions and tigers, away from their prey to grab pieces of the kill. I don't know if it makes sense to categorize humans in this way.
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ov64p
Diminishing returns on exercise. How big are we talking?
Exercise - how important is the "first hour"? * 0 hours/week - > no benefit * 1 hour/week - > X benefit * 2 hours/week - > Y benefit * 10 hours/week - > Z benefit Let's define "benefit" in a broad sense - cardiovascular health, fat loss, muscle gain, mortality rate. If you can provide a more specific measurement of benefit (i.e., study X found significant diminishing returns on muscle gain after an average of 4 hours/week...) that's helpful. What kind of difference between X, Y, and Z are we talking? Is the "first hour" of exercise per week as important as the next 9 combined? Or is this a close-to-linear scale when talking about reasonable amounts of time? (i.e. < 10 hours)
askscience
{ "a_id": [ "c3kbljo" ], "text": [ "The first hour a week is far and away the most important, because it stimulates the metabolism and muscle growth of an otherwise unhealthy/unsporty person. Someone who works out regularly should not notice a positive effect of such an extend after each individual workout.\n\nOther than that, you can't really define \"benefit\" in a broad sense; cardiovescular exercises have an entirely different effect than exercises for muscle gain.\n\nThe former have a fairly marginal \"diminishing returns\" effect - especially if you're working towards fat loss, you'll burn twice as many calories if you work out twice as often.\n\nFor muscle growth, on the other hand, too much exercise is actually counterproductive. A muscle needs approx. 48h rest after a workout." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Diminishing returns on exercise. How big are we talking? Exercise - how important is the "first hour"? * 0 hours/week - > no benefit * 1 hour/week - > X benefit * 2 hours/week - > Y benefit * 10 hours/week - > Z benefit Let's define "benefit" in a broad sense - cardiovascular health, fat loss, muscle gain, mortality rate. If you can provide a more specific measurement of benefit (i.e., study X found significant diminishing returns on muscle gain after an average of 4 hours/week...) that's helpful. What kind of difference between X, Y, and Z are we talking? Is the "first hour" of exercise per week as important as the next 9 combined? Or is this a close-to-linear scale when talking about reasonable amounts of time? (i.e. < 10 hours)
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3s08u3
What is happening when a person is anemic?
I few years ago I spent two days in the hospital with malaria. I was throwing up and feeling weak so I went to urgent care. My hemoglobin had dropped to just 6.1 gm/dL (I was a 24M). The doctor was shocked that I was even walking and got me into a hospital bed as fast as possible. Anyway, what was actually happening to my body because of that low level of hemoglobin?
askscience
{ "a_id": [ "cwsuxnu", "cwsxafj" ], "text": [ "Haemoglobin is a protein that is found in red blood cells that carries oxygen. When you have low haemoglobin levels (of which there are many causes) you have less oxygen being picked up to be delivered to your cells. This is why you feel weak and tired.", "The problem in the case of malaria is not with the hemoglobin; the decreased hemoglobin is a secondary finding. the parasite in malaria, Plasmodium, invades red blood cells and divides inside of them. Eventually, the cell can't handle that many parasites inside of it, and the red blood cell bursts. In this case, your anemia was brought about by the hemolysis of many RBCs which decreased your overall hemoglobin; however, your hemoglobin was working perfectly fine. \n\nRed blood cells carry oxygen on their hemoglobin molecules throughout the body. Now that you have less red blood cells, you have less hemoglobin, and a decreased ability to carry oxygen. The symptomology follows to be shortness of breath (because your brain is telling your lungs to breathe more to get more oxygen), tachycardia (because your heart needs to pump faster so it can move red blood cells around faster and deliver oxygen quicker), dizziness/lightheadedness (because your brain isn't getting enough oxygen), whitening of the skin/extremities (because your body attempts to give as much blood to your organs since they are the most important, so it shunts blood away from your skin, arms, and legs).\n\nAlso to note, because you have malaria you will also have a fever since you have an infection. This fever is cyclic so it will be on and off. Interestingly, the parasites throughout your blood burst red blood cells almost synchronously. This synchronous bursting is what causes the onset of fever. On top of that, your white blood cell count (specifically neutrophils) will be really high. You may also experience drenching sweats once your fever resides." ], "score": [ 6, 3 ] }
{ "url": [] }
{ "url": [] }
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What is happening when a person is anemic? I few years ago I spent two days in the hospital with malaria. I was throwing up and feeling weak so I went to urgent care. My hemoglobin had dropped to just 6.1 gm/dL (I was a 24M). The doctor was shocked that I was even walking and got me into a hospital bed as fast as possible. Anyway, what was actually happening to my body because of that low level of hemoglobin?
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mtj2b
How far away is a roadside "potalizer" test, and how might it work?
First, a bit of non-science background. I'm in favor of the legalization of cannabis with the fine folks over in r/Project420 (known as C:LEAR), but I realize that there are a LOT of obstacles that need to be overcome before legalization is a feasible option. The hurdle I'm researching now is THC testing from a law enforcement standpoint. Regardless of weather or not C:LEAR is successful tomorrow or in 20 years, an accurate roadside "potalizer" test would greatly help legalization as well as keeping impaired drivers off of the road. One of the big issues that law enforcement has with legalization is that it's very hard to determine weather a suspect is under the influence of THC, or is just really tired. From what I understand, courts have determined that the smell of cannabis alone is insufficient evidence to determine impairment. Blood tests are the most accurate way to determine if the driver is indeed impaired, but it's not yet practical to have blood testing stations in every traffic cop's car, much less to have the driver consent to having their blood drawn. What technologies should I be keeping an eye on, and how can we ensure that this test is near impossible for an impaired driver to beat?
askscience
{ "a_id": [ "c33rzl8", "c33spbg", "c33qdls", "c33uird" ], "text": [ "Here's some perspective from a former WA state deputy:\n\n In many states, DUI doesn't just mean alcohol. You could have had one too many Benadryls to control your allergies, and be too impaired to drive.\n\n When I saw someone swerving or failing to stop, and then pulled them over only to see bloodshot eyes and slow responses to my questions, I automatically suspected DUI. If you failed to adequately perform a roadside test, and then blew 0.0 on my breathalyzer, you were far from home free. More than likely I would call up my Sergeant and attempt to get a blood test warrant.\n\nI don't like it when people say that it's fine to drive while high on marijuana. It's not. Marijuana is a mind altering substance that changes your reactions to situations, usually not for the better. Driving while intoxicated, whether that be under the influence of alcohol, marijuana, cocaine, Nyquil, or legal prescription opiates, is not OK.\n\nThat being said, I'm for legalization as well, but don't take that to mean that I think it's OK to try to beat a potalyzer in the future. Don't drive while impaired.", "If it's hard to distinguish between someone who is baked and someone who is extremely tired, shouldn't we be testing for *impairment* instead of substances? If someone is impaired I want them off the road, I don't care if they are impaired because of alcohol, weed, lack of sleep, distraction, or anything else. Likewise, if they're not impaired, I don't really care.\n\nThe problem with drinking and driving (and probably most other drugs that affect reaction time) is that people can think they are just fine, but are actually impaired.\n\nTl;dr: an objective test for impairment would be better than any specific chemical tests.", "there are a lot of cheaply available tests today that check for the presence of an acidic degradation product of THC which is found in your blood, urine and hair.\n\nTHC itself degrades quickly, so they test for the degradation product instead. since currently no one conducting such tests seems to be interested in when or how much you've smoked but only *if* there is no money to be made in selling such a test. it would be pretty easy to make such a test though. instead of just indicating that your test substance reacted, you'd have to measure how much of it reacted. \n\nit is absolutely no problem to produce a roadside variant of this test today. as mentioned before, we have presence-based tests that simply use a strip of paper and it would be no problem to adapt those to measure precise amounts instead of mere presence.", "one of the problems with a marijuana test is that, unlike alcohol, THC and other cannabinoids stay in your blood and hair and such for quite a while after they've stopped altering your consciousness (not sure how long, but I've heard everything from a day or two to a couple of months). California, for example, allows medical marijuana patients to drive 6 or more hours after the last time they medicated, and it would be very difficult, if not impossible, to tell whether someone with THC in their blood smoked 4 hours ago or 14. This is further complicated by the fact that the duration of the \"high\" from marijuana is significantly affected by a lot of different factors, more so than alcohol. For example, marijuana taken orally lasts much longer than marijuana smoked." ], "score": [ 10, 8, 2, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
How far away is a roadside "potalizer" test, and how might it work? First, a bit of non-science background. I'm in favor of the legalization of cannabis with the fine folks over in r/Project420 (known as C:LEAR), but I realize that there are a LOT of obstacles that need to be overcome before legalization is a feasible option. The hurdle I'm researching now is THC testing from a law enforcement standpoint. Regardless of weather or not C:LEAR is successful tomorrow or in 20 years, an accurate roadside "potalizer" test would greatly help legalization as well as keeping impaired drivers off of the road. One of the big issues that law enforcement has with legalization is that it's very hard to determine weather a suspect is under the influence of THC, or is just really tired. From what I understand, courts have determined that the smell of cannabis alone is insufficient evidence to determine impairment. Blood tests are the most accurate way to determine if the driver is indeed impaired, but it's not yet practical to have blood testing stations in every traffic cop's car, much less to have the driver consent to having their blood drawn. What technologies should I be keeping an eye on, and how can we ensure that this test is near impossible for an impaired driver to beat?
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qi5kk
What causes genius burnout?
askscience
{ "a_id": [ "c3xt40q", "c3xsw94" ], "text": [ "In a psychology class I took, the professor said one contributing factor is that because of their intelligence levels, they do not relate well to others, view activities/people differently, and look down on most people as \"unintelligent\", focus on their work more. Basically, they isolate themselves, and this lack of normal human interaction can lead to \"eccentric\" behaviour. \n\nI do not know if people with high IQs have a higher percentage of actual mental disorders.", "Do you think that statistically geniuses exhibit more mental illness than the general public?" ], "score": [ 4, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
What causes genius burnout?
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1g3oym
Say a trustworthy friend claimed that he somehow traveled to the future and his only "proof" was a non-descript coin he picked up while visiting. You want to humor him. What scientific testing could be done on the coin to prove it was from the future?
askscience
{ "a_id": [ "caggx2e", "cagfp8w" ], "text": [ "Nearly everything in the world is contaminated from minute amounts of radioactive isotopes produced by nuclear testing. It makes it into everything, from paints to wines. By performing isotopic analysis, you can tell if a painting or wine was produced before or after the 1950s. Its now used to detect forgeries.\n\nAnd as most of these contaminants were released only over the period of a couple of decades, going forwards, we should be able to see less of them in the environment.\n\nSo, hypothetically, depending on the item and the halflife of the contaminants, we may be able to tell if it came from the future depending on the amount of radioisotope contamination left. If none is found at all, we know it predates the 1950s.", "This may be better suited for /r/AskScienceDiscussion, as it's rather open-ended" ], "score": [ 6, 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Say a trustworthy friend claimed that he somehow traveled to the future and his only "proof" was a non-descript coin he picked up while visiting. You want to humor him. What scientific testing could be done on the coin to prove it was from the future?
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3lk90t
Inteligent reptile?
It's common to consider dolphines, crows, chimps, rats, goats, octuposes ext. as exeptionaly smart, in general or compared to their closest relitives (Caprinae, rodents, birds, mollusces...). Is there a reptile species that has some notable problem solving / creativity / learning skills?
askscience
{ "a_id": [ "cv72dkc", "cv73edw" ], "text": [ "Monitor lizards are considered to be smart reptiles.\n\n > Varanid lizards are very intelligent, and some species can even count.[16] Careful studies feeding *V. albigularis* at the San Diego Zoo varying numbers of snails showed that they can distinguish numbers up to six.[16][17] *V. niloticus* lizards have been observed to cooperate when foraging.[16] One varanid lures the female crocodile away from her nest, while the other opens the nest to feed on the eggs.[16] The decoy then returns to also feed on the eggs.[16][17] Komodo dragons, *V. komodoensis*, at the National Zoo in Washington, D.C., recognize their keepers and seem to have distinct personalities.[17]\n\n_URL_1_\n\n > Komodo dragons [in captivity] have also been observed to engage in play with a variety of objects, including shovels, cans, plastic rings, and shoes. This behavior does not seem to be \"food-motivated predatory behavior\".[8][12][72]\n\n_URL_0_", "Worth remembering that the only thing that stops birds from being reptiles is the traditional labels! The birds are a branch within the reptiles just as humans are a branch within the apes, more closely related to crocodiles than crocodiles are to lizards. Birds are definitely the smartest reptiles-by-another-name, but the other reptiles aren't as peabrained as they are painted. Did you know that crocodiles use tools? They will gather sticks then approach colonies of water birds building nests, then lie partly submerged with the [sticks on their snout](_URL_4_), luring the birds in. When the birds land on the 'logs' to gather up the twigs, the crocodiles get a meal. [Wood turtles](_URL_4_) are better than lab rats at solving mazes! Lizard owners will tell you that each pet lizard has it's own temperament, and tame lizards will grow to recognise their owners and become [affectionate](_URL_5_), far from being robotically driven just by instinct. They are all also certainly capable of learning and adapting their behaviour, and even [learning by imitation!](_URL_5_)" ], "score": [ 13, 10 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "https://en.wikipedia.org/wiki/Komodo_dragon#In_captivity", "https://en.wikipedia.org/wiki/Monitor_lizard#Intelligence", "http://blogs.scientificamerican.com/blogs/cache/file/D49A2895-5593-480C-892F1A85AA44DF00.jpg", "https://www.youtube.com/watch?v=p-zGIS-WWZQ", "http://www.animalsbase.com/wp-content/uploads/2015/07/wood_turtle_.jpg", "http://www.lincoln.ac.uk/news/2014/09/970.asp" ] }
Inteligent reptile? It's common to consider dolphines, crows, chimps, rats, goats, octuposes ext. as exeptionaly smart, in general or compared to their closest relitives (Caprinae, rodents, birds, mollusces...). Is there a reptile species that has some notable problem solving / creativity / learning skills?
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1bm6wi
Bone Makeup
I am interested in what bones are made up of
askscience
{ "a_id": [ "c97xegf" ], "text": [ "> Bone itself consists mainly of collagen fibres and an inorganic bone mineral in the form of small crystals. In vivo bone (living bone in the body) contains between 10% and 20% water. Of its dry mass, approximately 60-70% is bone mineral. Most of the rest is collagen, but bone also contains a small amount of other substances such as proteins and inorganic salts.\n\n > Collagen is the main fibrous protein in the body. It has a triple helical structure, and specific points along the collagen fibres serve as nucleation sites for the bone mineral crystals. This is shown in the animation below.\n\n\n > The composition of the mineral component can be approximated as hydroxyapatite (HA), with the chemical formula Ca10(PO4)6(OH)2. However, whereas HA as has a Ca:P ratio of 5:3 (1.67), bone mineral itself has Ca:P ratios ranging from 1.37 - 1.87. This is because the composition of bone mineral is much more complex and contains additional ions such as silicon, carbonate and zinc.\n\nSource: _URL_0_\n\n_URL_1_" ], "score": [ 5 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.doitpoms.ac.uk/tlplib/bones/structure.php", "https://www.google.com/search?q=composition+of+bones&amp;ie=utf-8&amp;oe=utf-8&amp;aq=t&amp;rls=org.mozilla:en-US:official&amp;client=firefox-a" ] }
Bone Makeup I am interested in what bones are made up of
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wtt5x
How realistic was the last episode of Breaking Bad? [MAGNETS!!]
Sorry for the crappy quality, but this is really the only video I could find that would give a brief background to what I'm talking about for those who don't watch the show. _URL_0_ Basically, the main character gets a high powered magnet from a scrapyard, powers it with I believe 24 batteries, carries it in a truck, and takes it to a police station. They then pull the truck up, magnet still inside, to outside the police station adjacent to the wall where the evidence room is located. Then, from outside the police station, they engage the magnet which then causes all the metallic objects inside the evidence room to go flying through the air and crashing against the wall, destroying them in the process. All of this happens through 2+ feet of concrete. The magnet itself is about 8 feet away from the concrete wall in question, so there's at LEAST 10+feet of distance between the magnet and whatever it pulls towards the wall. So /r/askscience, is this even possible?
askscience
{ "a_id": [ "c5gec78" ], "text": [ "It is not realistic at all.\n\nElectromagnets, outside of very specialized setups, are rarely more than [2 Tesla in strength](_URL_3_). For comparison the magnet in an MRI is around 1.5 - 3 Tesla in strength.\n\nI have worked around MRI machines and the safe distance from one (that wouldn't erase your credit cards and such) was about ten feet away (a bit less actually but better safe than sorry).\n\nHere is an image that shows the [5G line](_URL_1_) for an MRI machine. 5G (Gauss) is about 0.0005 Tesla (0.5 militesla). That is the safe distance for someone with a pacemaker. For comparison a [typical refrigerator magnet is about 5 militesla](_URL_2_).\n\nSo no, no way the magnet in the show is anywhere near strong enough to do what they are showing. It would not make the laptop fly across that distance. It'd have to be much closer.\n\nStronger magnets have been made but they are very rare, specialized lab equipment, quite large and quite expensive. Above 100 Tesla magnets destroy themselves (so they are turned on, run for a fraction of a second and demolish themselves). Even at 100 Tesla the pressure inside the magnet is [equivalent to 200 sticks of dynamite going off](_URL_0_)." ], "score": [ 11 ] }
{ "url": [] }
{ "url": [ "http://www.youtube.com/watch?v=slWwuFclNwQ" ] }
{ "url": [ "http://www.msnbc.msn.com/id/26663136/ns/technology_and_science-science/t/scientists-build-worlds-most-powerful-magnet/#.UAhQ46B_UdU", "http://patientsafetyauthority.org/ADVISORIES/AdvisoryLibrary/2009/Mar6%281%29/PublishingImages/20_fig3.JPG", "http://en.wikipedia.org/wiki/Orders_of_magnitude_%28magnetic_field%29", "http://www.lbl.gov/Science-Articles/Archive/14-tesla-magnet.html" ] }
How realistic was the last episode of Breaking Bad? [MAGNETS!!] Sorry for the crappy quality, but this is really the only video I could find that would give a brief background to what I'm talking about for those who don't watch the show. _URL_0_ Basically, the main character gets a high powered magnet from a scrapyard, powers it with I believe 24 batteries, carries it in a truck, and takes it to a police station. They then pull the truck up, magnet still inside, to outside the police station adjacent to the wall where the evidence room is located. Then, from outside the police station, they engage the magnet which then causes all the metallic objects inside the evidence room to go flying through the air and crashing against the wall, destroying them in the process. All of this happens through 2+ feet of concrete. The magnet itself is about 8 feet away from the concrete wall in question, so there's at LEAST 10+feet of distance between the magnet and whatever it pulls towards the wall. So /r/askscience, is this even possible?
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mkkqg
A question for ichthyologists: Is it possible to strap on a saddle and harness on a great white shark and ride them?
Just a random thought, let's set some parameters. [Here's the shark.](_URL_1_) * The diver is on a full scuba suit, with enough oxygen for a 45 minute dive. * Tranquilizers for the great white to strap on a harness and saddle for the diver. Whether they're much like a horse's or adjusted for a horizontal ride is discussable. * Harness and saddle obviously allowing freedom of movement and non-chafing so the great white doesn't suffer while wearing them. Maybe chain or carbon fiber straps so the shark doesn't snap them open? ___________________________________________________ With all that in mind, would an experienced scuba diver be able to ride a shark akin to people riding horses around? Would the diver be able to control the shark's movements by turning the great white's head, or would the shark simply ignore the diver and dive uncontrollably in and out of the depths, eventually eating the diver after giving them the bends? [***I made a visual aide here***](_URL_0_)
askscience
{ "a_id": [ "c31rvpx", "c31ovay", "c31rkap" ], "text": [ "Marine biologist here. In short answer, yes, there is no reason why you couldn't strap a harness on a Great White. But, I am also a life-long equestrian and the part we're missing here are the years of training that go into being able to actually ride an animal. Horses go through a lot of training to understand that it must follow the tug on the reins, not pull against them. The easier way to control a shark would be something that impacts the shark's Ampullae of Lorenzini, which are the organs on a shark's snout that allow it to sense electromagnetic impulses. If you were to make a device that put out pulses that the shark would want to move towards or away from, that would be a much easier method of steering that would require no training. But, the ultimate answer is no, a harness would not give you control over a shark which can grow up to 25 feet long without causing the animal pain.", "Seems like whatever was attached to the head of the shark would have to either be biteproof or attached in such a way that it's not in the shark's mouth. \n\nfun question!", "I always wanted to be an ichthyologist when I was a kid.\n\nSome sharks have completely lost the ability to breathe by buccal pumping, and these are the sharks that will drown if they stop swimming and ramming water. These sharks are known as obligate ram breathers (or obligate ram ventilators); only about two dozen of the 400 identified shark species are required to maintain this forward swimming motion . These include the great white shark, the mako shark, the salmon shark and the whale shark.\n\nYou would have to solve the problem of getting the harness attached to the shark while keep the shark's gills oxygenated." ], "score": [ 4, 4, 3 ] }
{ "url": [] }
{ "url": [ "http://imgur.com/RJvOl", "http://gizmodo.com/5861460/this-photo-really-gives-a-perfect-idea-of-the-terrifying-size-of-a-white-shark" ] }
{ "url": [] }
A question for ichthyologists: Is it possible to strap on a saddle and harness on a great white shark and ride them? Just a random thought, let's set some parameters. [Here's the shark.](_URL_1_) * The diver is on a full scuba suit, with enough oxygen for a 45 minute dive. * Tranquilizers for the great white to strap on a harness and saddle for the diver. Whether they're much like a horse's or adjusted for a horizontal ride is discussable. * Harness and saddle obviously allowing freedom of movement and non-chafing so the great white doesn't suffer while wearing them. Maybe chain or carbon fiber straps so the shark doesn't snap them open? ___________________________________________________ With all that in mind, would an experienced scuba diver be able to ride a shark akin to people riding horses around? Would the diver be able to control the shark's movements by turning the great white's head, or would the shark simply ignore the diver and dive uncontrollably in and out of the depths, eventually eating the diver after giving them the bends? [***I made a visual aide here***](_URL_0_)
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6j4l18
Is the world getting windier?
askscience
{ "a_id": [ "djc35gz" ], "text": [ "In Short: [yes](_URL_0_) \nThe winds are getting stronger, though it is more the extreme events that are getting stronger. rather than the \"normal\" winds that are getting stronger. \nThey also say that it is not necessarily climate change that is causing this though. They only analysed data over a timespan of 23 years. In that timespan variations of interannual oscillations and similar mechanisms can appear as linear trends." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://science.sciencemag.org/content/332/6028/451.full" ] }
Is the world getting windier?
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13v1zz
Arafat 210Polonium poisoning detection
Hello, today, they exhumed Yasser Arafat's body to test whether he died by polonium poisoning. I was wondering what tests would be performed to determine the cause of death. By my calculations, the residual amount of Po should be nearly insignificant [(10 mg polonium ingested (WAG))/(210 grams/mol)]*6.023e23 atoms/mol*exp(-8years/138days)=1.82e10 atoms , which comes out to about 2.28e5 atoms per gram of tissue pre-death. I assume that they will focus on daughter isotopes in the decay chain and some form of spectroscopy - Any idea which decay products and which techniques? caveat - possible errors in calculation.
askscience
{ "a_id": [ "c77f6o3" ], "text": [ "This is roughly 22 half-lives, so only 1 part in 4 million still remains. (I'm just leaving these numbers here because I was curious what they were)" ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Arafat 210Polonium poisoning detection Hello, today, they exhumed Yasser Arafat's body to test whether he died by polonium poisoning. I was wondering what tests would be performed to determine the cause of death. By my calculations, the residual amount of Po should be nearly insignificant [(10 mg polonium ingested (WAG))/(210 grams/mol)]*6.023e23 atoms/mol*exp(-8years/138days)=1.82e10 atoms , which comes out to about 2.28e5 atoms per gram of tissue pre-death. I assume that they will focus on daughter isotopes in the decay chain and some form of spectroscopy - Any idea which decay products and which techniques? caveat - possible errors in calculation.
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tv57m
What is the difference between work and play in our heads?
Why is it that doing something like managing spread sheets is boring, and something like playing an MMO is engaging? Or that we hate to do menial factory work of repeating the same action over and over, but we like to play rhythm games like DDR etc.? It seems like the approximately the same action, but working ten or twelve hours a day can lead to stress and poor health while I'm sure many people would have no problem playing games for that long.
askscience
{ "a_id": [ "c4q4f7e", "c4q5xru", "c4qartp", "c4q5a7j" ], "text": [ "\"Play\" activities generally have some sort of payoff that triggers a release of dopamine and endorphins in your brain. \"Work\" activities become a daily grind because you lose that payoff step through repetition. When you play DDR you immediately get the reward when the song ends, when you do factory work you get your reward two weeks later in the form of a check. \nPlaying video games will kill you just as surely, you'll just enjoy it more.\n\ntl;dr\nYou're in a big [Skinner Box](_URL_0_). It's all about when you get the treat.", "As a game design student I encountered the great book Man, Play and Games by R. Callois last year and I would highly recommend it as I think it should answer your question or at least give you some insight on this matter.\n\n_URL_1_\n\nTo put it short, if I remember correctly, It's all about the fact that games/play create a separate world with simple rules to comprehend and to follow. There's nothing of value being produced in the game world therefor, we don't get the stress related to producing. You can always escape your responsibilities in a game by leaving the game world, be it football, basketball or an MMO. But the moment we start getting paid or produce anything of value for our play it stops being a game/play. (I guess that's where the problem lies with educational and serious games in general, hehe)\n\nIf there's someone here that is more familiar with R. Callois' work then please chip in because my memory is not as good as I had hoped.", "Looks like I've come late to the party. This is an interesting question! The difference between \"work\" and \"play\" has less to do with the nature of tasks and more to do with how we *construe* those tasks. Anyway, I believe [this paper](_URL_4_) from the Journal of Consumer Behavior may answer your question. Let me explain further:\n\nThe idea of [intrinsic motivation] (_URL_4_) may partly account for why \"work\" and \"play\" might feel different. Playing is often a choice *you* make. You aren't forced to play. If your motivations for \"playing\" are no longer intrinsic to you, then it might start to feel like work.\n\nWhy would intrinsic motivation matter? Well, there is evidence that intrinsically (i.e. autonomously) chosen tasks incur [less drain upon self-control](_URL_5_). Hence, \"work\" can be psychologically exhausting in ways that \"play\" may not be. Ultimately though, it's largely a matter of perspective.\n\nThis is just the tip of the iceberg, though. Work and play also differ in terms of reward contingencies, goal structures, etc. We also spend **much** more time at \"work\" than at \"play\"; this makes playing a much more desirable behaviour as per [Timberlake's response deprivation theory](_URL_5_).", "This is really relevant to me, as someone who has been playing video games very regularly since age 5 (now 19) including a year of WoW with over 2 months playtime on my main character last year. I am trying to give up gaming in favour of more useful hobbies e.g. learn programming languages, socialising more, learning foreign languages, self-teach/internet teach extra courses I can't fit into my degree at uni. However I am really struggling and I would have to agree with the answers already provided that it is a lack of short term rewards making my attempt to take on more productive hobbies unsuccessful. Does anyone with or without psychology experience have any suggestions or comments." ], "score": [ 16, 4, 2, 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Skinner_box", "http://en.wikipedia.org/wiki/Man,_Play_and_Games", "http://www.jstor.org/stable/10.1086/656576", "http://users.ipfw.edu/abbott/314/Premack.html", "http://mmrg.pbworks.com/f/Ryan,+Deci+00.pdf", "http://onlinelibrary.wiley.com/doi/10.1111/j.1751-9004.2008.00098.x/abstract;jsessionid=2921A40D89F33A5BB893DBEF3AD0AC54.d01t01?userIsAuthenticated=false&amp;deniedAccessCustomisedMessage=" ] }
What is the difference between work and play in our heads? Why is it that doing something like managing spread sheets is boring, and something like playing an MMO is engaging? Or that we hate to do menial factory work of repeating the same action over and over, but we like to play rhythm games like DDR etc.? It seems like the approximately the same action, but working ten or twelve hours a day can lead to stress and poor health while I'm sure many people would have no problem playing games for that long.
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2ysqe7
Would it confuse your brain if you switched sides on your eyes?
I was curious how wired the brain is to seeing what it sees. Brain games talks about all the assumptions the brain makes. I started wondering what would happen if you switched them with special binoculars. So the right eye saw what the left normally sees and vice versa.
askscience
{ "a_id": [ "cpcn9oz" ], "text": [ "If the input stayed consistent, then the [brain would probably adapt and correct](_URL_0_)." ], "score": [ 16 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.theguardian.com/education/2012/nov/12/improbable-research-seeing-upside-down" ] }
Would it confuse your brain if you switched sides on your eyes? I was curious how wired the brain is to seeing what it sees. Brain games talks about all the assumptions the brain makes. I started wondering what would happen if you switched them with special binoculars. So the right eye saw what the left normally sees and vice versa.
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27ak7y
Do Toadstool move by themselves? And do they obtain food from living things?
askscience
{ "a_id": [ "chz54cn" ], "text": [ "The toadstool is only the fruiting body of the fungus. Most of the fungus is in the form of mycelium. You can think of the mycelium as the \"roots\" of the fungus. The mycelium is what is obtaining the food. Most fungi that produce toadstools are decay fungi and usually absorb their nutrients from dead organic matter. Fungi can reproduce asexually and sexually, and only produce the toadstools or mushrooms when conditions are unfavorable for asexual reproduction. \n\nTL;DR. Mushrooms are only a fruiting body of the fungus, they sprout up from the mycelium when conditions are unfavorable for asexual reproduction." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Do Toadstool move by themselves? And do they obtain food from living things?
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msvbz
A friend of mine was trying to convince me that the neurological concepts in this were sound. Any neurologists out there?
_URL_0_
askscience
{ "a_id": [ "c33ku3x" ], "text": [ "I have never heard of this. [Pubmed](_URL_0_) has some articles on using vestibular rehabilitation to correct the _vestibular_ symptoms of concussion. I don't know a whole lot about vestibular rehabilitation (the specialist physical therapists do this), but I don't think it usually involves a big 6DOF machine.\n\nThe white-coated man is Dr Carrick, who apparently runs the [Carrick Institute for Graduate Studies](_URL_1_). He is a PhD but also a DC, a doctor of chiropractic with a professorship at a chiropractic school. Chiropractors are not physicians, and receive very different training.\n\nWhat he says in the video, with the proviso that it may have been edited, and may have been dumbed down for a lay audience, is gobbledygook.\n\n**EDIT**: His spiel is functional neurology, which seems to be a big buzzword among chiropractors interested in neurologic disorders. Reading just a few sites so far, I don't have a good handle on just what it's supposed to be." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [ "http://watch.discoverychannel.ca/clip574738#clip574738" ] }
{ "url": [ "http://www.ncbi.nlm.nih.gov/pubmed?term=vestibular%20rehabilitation%20concussion", "http://www.carrickinstitute.org/CIAbout.asp" ] }
A friend of mine was trying to convince me that the neurological concepts in this were sound. Any neurologists out there? _URL_0_
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177lq1
Why don't we steal nature's designs more often?
askscience
{ "a_id": [ "c82ymbq" ], "text": [ "You might want to change your tag to 'Engineering' instead of 'Physics'." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
Why don't we steal nature's designs more often?
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z2ia9
Trying to remember a beautiful fluid dynamics problem and solution from my Uni days...
askscience
{ "a_id": [ "c60y1rb" ], "text": [ "Right, well hopefully someone better informed will answer but for the moment I will add what I can. If it is a fluid mechanics problem no doubt Navier Stokes would have been used. Then what limits this set of equations to be solved ( I am assuming 1D or 2D as 3D gets highly complex and solutions are usely solved by computers at that stage) is by setting the Boundary conditions (like no slip condition at wall , incompressible ... etc) Then several terms can be gotten rid of using these boundary conditions. For most problems this leaves you with a simple differential equation to solve. For the case of the bucket I am guessing you would use cyclindrical coordinates to set it up, apply your boundary conditions , eradicate the terms which are zero and then solve leaving you with several equations describing the velocity profiles. The following paper is for something slightly similar aperture in a wall ( basically a hole in the side of something...) _URL_0_ It shows you the Navier Stokes equation and the simplifications using the boundary conditions and also gives a nice diagram of the velocity profiles at different values of the Reynolds number. Hope this gives you something to start with !! Sorry I can't describe more but it's the summer and eventhough I just did my advanced fluid mechanics course my brain is still a little rusty..." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.aem.umn.edu/people/faculty/joseph/archive/docs/956-aperture-old1.pdf" ] }
Trying to remember a beautiful fluid dynamics problem and solution from my Uni days...
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31kaz9
What other things like seeing our nose and breathing we ignore by default?
askscience
{ "a_id": [ "cq2mgq8", "cq35x4g", "cq2o2kz" ], "text": [ "We do this all the time with things that aren't changing in our environment. For example, when you first put your clothes on in the morning you feel them on your skin, but, very rapidly you stop noticing them. Now that you've read this, you might become aware of your clothing again! The same applies to ambient noise like traffic from the street or the ticking of a clock in your room.", "There is actually a hole in your sight. Close one eye and take your thumb and, keeping your open eye facing directly forward and focused on a point in the background, move it across your field of view. Eventually, you will noticed that a portion of your thumb will disappear. This is completely natural and present in both eyes. Your brain compensates for this whole in the center of your vision.", "Generally speaking it's almost impossible to tickle yourself. Your brain filters the sensation of touching ourself to prevent the response another's might provoke. There are exceptions to this.\n\nSomeone's going to mention you're schizophrenic if you can, but having an ailment like that is a lot more complicated than passing one simple test." ], "score": [ 3, 3, 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
What other things like seeing our nose and breathing we ignore by default?
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1274w0
Why are some pennies magnetic?
askscience
{ "a_id": [ "c6sqce5" ], "text": [ "After 2000 they went from being mostly zinc (~98%) to mostly steel (~94%). [Source](_URL_0_)\n\nIt looks like just about all the different denominations did the same, so it might be possible to magnetize all of them." ], "score": [ 2 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://www.bcscta.ca/resources/hebden/chem/Coin%20Compositions.pdf" ] }
Why are some pennies magnetic?
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19rdw6
How reliable and accepted is the 'Triune brain' theory? It seems to pop up everywhere but it does not seem to be well accepted. Is it simply a nice, convenient idea that laymen get drawn too?
Thanks in advance
askscience
{ "a_id": [ "c8qre0y" ], "text": [ "There are aspects of the triune brain model which are still accepted as useful and correct; but not all of the original formulation has survived extended study. See for instance [the Wikipedia article](_URL_0_), particularly the section \"Status of the Model\" for some info." ], "score": [ 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "http://en.wikipedia.org/wiki/Triune_brain" ] }
How reliable and accepted is the 'Triune brain' theory? It seems to pop up everywhere but it does not seem to be well accepted. Is it simply a nice, convenient idea that laymen get drawn too? Thanks in advance
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irou7
How come no other animal has come scientifically across the mental Rubicon we have? And what scientific evidence can we have to prove no other animal has.
To think therefore I am. How come it seems we are the only animal to effectively cross that line of consciousness. To think about improving, settling down, moral decisions of the sort. Are we holding animals back from evolving by our practice of hunting and herding them? Also, what scientific method is there to prove any sort of morality within a species. For instance, how can we prove we are moral but some fundamentalist will argue the opposite for dogs? (This might be a theology and science question, i'm sorry if it is)
askscience
{ "a_id": [ "c263t93" ], "text": [ "Well, first of all, it's pretty difficult to analyze the amount of consciousness another animal has, so I'm not sure there is an answer for you in that regard. Regarding stemming the evolution of other animals by overhunting: you are assuming here that evolution is goal-oriented and that goal happens to be self-consciousness/morality/altruism etc. That is simply not true. The reason that these traits are shared among humans is because they are specific adaptations that worked for us in our niche. Another species in another niche may not benefit from these adaptations (brains are incredibly energetically expensive to produce and maintain; if its development doesn't greatly improve the fitness of the organism, it will not be strongly selected for).\n\nAnd regarding morality, keep in mind that morality really is an accident of birth. Things that may seem moral to you in your culture may not be moral in other cultures. There is no fundamental concept of morality; it is all relative and situational. The evolution of morality is not necessarily clear or universal. Would there be a reason for animals like dogs to develop morality? How do you even define morality? What I'm trying to say is you can't define this concept of 'morality' for human beings, let alone for other animals, so I'm not sure if there's really an answer here for you." ], "score": [ 10 ] }
{ "url": [] }
{ "url": [] }
{ "url": [] }
How come no other animal has come scientifically across the mental Rubicon we have? And what scientific evidence can we have to prove no other animal has. To think therefore I am. How come it seems we are the only animal to effectively cross that line of consciousness. To think about improving, settling down, moral decisions of the sort. Are we holding animals back from evolving by our practice of hunting and herding them? Also, what scientific method is there to prove any sort of morality within a species. For instance, how can we prove we are moral but some fundamentalist will argue the opposite for dogs? (This might be a theology and science question, i'm sorry if it is)
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br9qmx
How would the result have changed if Pavlov linked the noise directly after the meal (fullness) opposed to before/during?
askscience
{ "a_id": [ "eoehhdf" ], "text": [ "I would assume it would work similarly but with satiety (fullness) instead of hunger. We sort of see this in people when you eat a full small plate of food vs the same portion at least for the most part.\n_URL_0_\nWhile not completely backing this idea it would seem like the pathways are there in us at least for this sort of conditioning. However as time goes on I am beginning to think that overeating needs to be treated like an addiction and less of a lifestyle choice." ], "score": [ 3 ] }
{ "url": [] }
{ "url": [] }
{ "url": [ "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5598018/" ] }
How would the result have changed if Pavlov linked the noise directly after the meal (fullness) opposed to before/during?
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