Caffeine!

Hank delves into the details about that very popular substance: caffeine.

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SOURCES
http://coffeefaq.com/site/node/17
http://www.ncpa.org/sub/dpd/index.php?Article_ID=13971
http://www.wisegeek.com/what-are-natural-sources-of-caffeine.htm
http://www.wisegeek.com/what-is-kola-nut.htm
http://www.independent.co.uk/news/science/under-the-microscope-how-does-caffeine-work-1993056.html
http://chemistry.about.com/od/moleculescompounds/a/caffeine.htm
http://en.wikipedia.org/wiki/Caffeine
http://en.wikipedia.org/wiki/Kola_nut
http://www.erowid.org/chemicals/caffeine/caffeine_info1.shtml#2
http://coffeefaq.com/site/node/12

Видео Caffeine! канала SciShow