TED Talks

Peter Ward: Earth’s mass extinctions

TV-PG
2009 • E16    Jan 28, 2009    22m
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.

Where to Watch TED Talks - 2009 • E16

 

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