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Peter Ward: Earth's mass extinctions

http://www.ted.com Asteroid strikes get all the coverage, but "Medea Hypothesis" author Peter Ward argues that most of Earth's mass extinctions were caused by lowly bacteria. The culprit, a poison called hydrogen sulfide, may have an interesting application in medicine. TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their lives in 18 minutes. Featured speakers have included Al Gore on climate change,?Philippe Starck on design,?Jill Bolte Taylor on observing her own stroke,?Nicholas Negroponte on One Laptop per Child,?Jane Goodall on chimpanzees, and?"Lost" producer JJ Abrams on the allure of mystery.?TED stands for Technology, Entertainment, Design, and TEDTalks cover these topics as well as science, business, development and the arts. Watch the Top 10 TEDTalks on TED.com, at?http://www.ted.com/index.php/talks/top10
Length: 21:42

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