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http://www.huffingtonpost.com/2012/09...9/marijuana-and-cancer_n_1898208.html
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Excellent diagram of rocket in plain English.
http://xkcd.com/1133
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Unlike mammals, birds don't urinate. Their kidneys extract nitrogenous wastes from the bloodstream, but instead of excreting it as urea dissolved in urine as we do, they excrete it in the form of uric acid. Uric acid has a very low solubility in water, so it emerges as a white paste
http://answers.yahoo.com/question/index?qid=20060920115205AAVYkHq
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Interesting...We pee to get rid of ammonia, which is converted to urea by liver (I think). Pee is yellow from byproducts of breakdown of bile pigment bilirubin (again done in liver?)
http://sxxz.blogspot.com/2006/07/why-is-urine-yellow.html
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What is air composed of?
See pie chart: 20% oxygen, 78% nitrogen, 2% other stuff including CO2.
http://www.propertiesofmatter.si.edu/Air_Heads.html
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http://www.youtube.com/watch?v=uflPNJnTXKc
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raw sewage is home to thousands of novel, undiscovered viruses, some of which could relate to human health
http://www.sciencedaily.com/releases/2011/10/111005172651.htm
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http://rsbl.royalsocietypublishing.org/content/7/2/168
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