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A theory of Earth's mass extinctions

TED2008 · 19:41 · Filmed Feb 2008
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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.

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Paleontologist
Peter D. Ward studies life on Earth — where it came from, how it might end, and how utterly rare it might be. Full bio

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