In conclusion: 1  Consider water from any source as contaminated with disease causing organisms. 2  By far the best way to treat water is by boiling it. 3  You only have to bring the water to a boil.  Donât waste fuel; there is no need to boil water for 10-minutes, 5-minutes, or even 1-minute.
Razor (philosophy) In philosophy, a razor is a principle or rule of thumb that allows one to eliminate (shave off) unlikely explanations for a phenomenon. Razors include: Occam's razor: When faced with competing hypotheses, select the one that makes the fewest assumptions. Do not multiply entities without necessity.
Here's how shaving works: A razor is a sharp blade that cuts the hair off close to the skin. Shaving removes the tip of the hair shaft that pokes out of the skin, but the hair grows back. Your skin might stay smooth for as little as a day or as long as 3 days.