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The central stars of planetary nebulae are very hot .
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The bacteria that cause urinary tract infections usually go into the bladder from the uretha .
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Not every conjecture can be proven true or false .
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Not every conjecture ends up being proven true or false .
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Polonium has 33 isotopes , and all of them are radioactive .
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Polonium has 42 known isotopes , all of which are radioactive .
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The region has steep , glacier - carved mountains , glens and interspersed plains .
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Arachnids produce digestive juices in their stomachs , and use their pedipalps and chelicerae to pour them over their dead prey .
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A key feature of NMR is that the resonance frequency of a particular simple substance is usually directly proportional to the strength of the applied magnetic field .
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It was the mathematical aspect of surveying that led him to exploring the geometrical significance of complex numbers .
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Moths , usually their caterpillars , are a major farm pest in many parts of the world .
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It is held in many mental health circles that masturbation can relieve depression , stress and lead to a higher sense of self-worth .
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The traditional cuisine is famous for an abundance of vegetables and greens used seasonally in the dishes .
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A battle between the wilds and pets ensues , with the Pet Paradiso security focused on tranquilizing the wilds .
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There was a smallpox epidemic in 1839 that killed a large part of the population of the area .
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Some obligate anaerobes use fermentation , while others use anaerobic respiration .
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This is judged to be one of the pivotal battles in the control of Indian subcontinent by the colonial powers .
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Viral infections in animals provoke an immune response that usually eliminates the infecting virus .
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On Earth , most basalt magmas have formed by melting of the mantle .
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On Earth , most basalt magmas have formed by decompression melting of the mantle .
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The test vehicle , which was used as an atmospheric drop test glider , had no propulsion system .
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It is possible for the frenulum of the penis to tear during sexual activity .
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It is possible for the frenulum to tear during sexual activities .
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Observations of atmospheric chemistry are essential to our understanding .
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Many traditional wood joinery techniques use the distinctive material properties of wood , often without resorting to mechanical fasteners or adhesives .
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The authority of appellate courts to review the decisions of lower courts varies widely from one jurisdiction to another .
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The of appellate courts to review decisions of lower courts varies widely from one jurisdiction to another .
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Typically the inner container is immersed about halfway into the working liquid .
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The tits are insectivorous , and eat a wide range of small insects and other invertebrates , particularly small leaf-eating caterpillars .
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Sometimes certain types of amnesia fix themselves without being treated .
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The nautilus shell is one of the finest natural examples of a logarithmic spiral .
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The nautilus shell presents one of the finest natural examples of a logarithmic spiral , although it is not a golden spiral .
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Humans play a key role in the biosphere , with the large human population dominating many of Earth 's ecosystems .
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Much of the classical guitar repertoire is in E minor , as this is a very natural key for the instrument .
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A neutral atom has the same number of electrons as protons .
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It has often been noted for its complex lightcurves , which made finding its shape and rotation somewhat hard .
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The flattened bodies of stingrays allow them to effectively conceal themselves in their environments .
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Hedgehogs are nocturnal , but gymnures are less so .
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Hedgehogs are nocturnal , but gymnures are less so , and may be active during the day .
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Chlorophyll is vital for photosynthesis , which allows plants to absorb energy from light .
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Chlorophyll is necessary for photosynthesis , which allows plants to obtain energy from light .
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The letter 'h ' is used to represent aspirated consonants .
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The letter 'h ' is used to aspirate certain consonants .
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No terrestrial globes from Antiquity or the Middle Ages have survived .
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In recent times , tropical disturbances that reach tropical storm intensity are named from a predetermined list .
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Hawks , like most vertebrates , have four types of color receptors in the eye .
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There is little evidence that using preventative antibiotics decreases urinary tract infections in children .
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The evidence that preventive antibiotics decrease urinary tract infections in children is poor .
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Most coral reefs were formed after the last glacial period when melting ice caused sea level to rise and flood continental shelves .
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A flounder 's food is mainly fish spawn , crustaceans , polychaetes and small fish .
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No firm dates can be assigned to this Emperor 's life or reign , but he is conventionally considered to have reigned from 507 to 531 .
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Herbivores are dependent on plants for food , and have evolved mechanisms to obtain this food despite the evolution of a diverse arsenal of plant defenses .
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Herbivores depend on plants for food , and have evolved mechanisms to get this food despite the evolution of many plant defences .
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Under some conditions , such as extremely low temperature , some ceramics show superconductivity .
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A frequency distribution is said to be skewed when its mean and median are different , or more generally when it is asymmetric , depending on the textbook .
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A frequency distribution is said to be skewed when its mean and median are different .
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Renewable energy projects in many developing countries have demonstrated that renewable energy can directly contribute to poverty alleviation by providing the energy needed for creating businesses and employment .
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There are two objects , one convex and one nonconvex , that can both be called regular icosahedra .
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There are two objects , one convex and one concave , that can both be called regular icosahedra .
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Metics typically shared the burdens of citizenship without any of its privileges .
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There is marked sexual dimorphism in this species .
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There is some sexual dimorphism in this species .
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Because metals are good conductors of electricity , they are valuable in electrical appliances and for carrying an electric current over long distances with little energy loss or dissipation .
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The dorsal and anal fins are divided into anterior spiny and posterior soft-rayed portions , which may be partially or completely separated .
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The dorsal and anal fins are divided into front spiny and back soft-rayed portions , which may be partially or completely separated .
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In Hydrology , dissipation is the process of converting mechanical energy of downward flowing water into thermal and acoustical energy .
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Dissipation is the process of converting mechanical energy of downward - flowing water into thermal and acoustical energy .
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The symptoms of strep throat usually improve within three to five days , irrespective of treatment .
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Spontaneous abortions occur in various mammals .
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In August and September 2011 the statue was vandalized three times , most recently being splashed with red paint .
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In some groups , the elytra are fused together , rendering the insect flightless .
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The primary application of cheminformatics is in the storage , indexing and search of information relating to compounds .
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The primary application of cheminformatics is in the storage of information relating to compounds .
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A stream cipher makes use of a much smaller and more convenient cryptographic key , for example 128 bits keys .
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Later ornithopods became larger , but never rivaled the incredible size of the long-necked , long-tailed sauropods that they partially supplanted .
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Later ornithopods became larger , but never reached the huge size of the long-necked , long-tailed sauropods which they largely replaced .
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Praxidike belongs to the Ananke group , believed to be the remnants of a break - up of a captured asteroid .
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Praxidike belongs to the Ananke group , believed to be the remnants of a break - up of a captured heliocentric asteroid .
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Croup is typically diagnosed based on signs and symptoms .
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Cockatoos are recognizable by the prominent crests and curved bills .
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Eunomia has been seen occulting stars three times .
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Many sans-serif typefaces use plainer oblique designs instead of italic ones .
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Many sans serif typefaces use oblique designs instead of italic ones .
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Centrioles are typically made up of nine sets of short microtubule triplets , arranged in a cylinder .
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Most centrioles are nine sets of microtubule triplets , arranged in a cylinder .
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Cenotes are surface connections to subterranean water bodies .
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The ability to fly or glide has been suggested for at least five dromaeosaurid species .
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The ability to fly or glide has been suggested for at least two dromaeosaur genera .
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Wormholes are a common element in science fiction because they allow rapid interstellar , intergalactic , and sometimes even interuniversal travel .
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Eucalypts draw a tremendous amount of water from the soil through the process of transpiration .
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Mycobacterial infections are notoriously difficult to treat .
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Mycobacterial infections are difficult to treat .
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Unaipon took out provisional patents for 19 inventions but was unable to afford to get any of his inventions fully patented , according to some sources .
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Unaipon took out provisional patents for 19 inventions , but he could not afford to get any of his inventions fully patented .
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Limited omnibus editions collect roughly 24 issues in a slipcase with several extras .
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A volcanologist is a geologist who studies the eruptive activity and formation of volcanoes , and their current and historic eruptions .
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The metabolic system of a particular organism determines which substances it will find nutritious and which poisonous .
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The metabolic system of an organism decides which substances it finds nutritious and which poisonous .
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The party favors the civil right to information privacy and reforms of copyright , education , genetic patents and drug policy .
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Subfamily Nymphicinae Subfamily Calyptorhynchinae : The black cockatoos Subfamily Cacatuinae
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