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.
Peter D. Ward studies life on Earth -- where it came from, how it might end, and how utterly rare it might be.
http://www.ted.com/talks/peter_ward_on_mass_extinctions.html
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