View full lesson: http://ed.ted.com/lessons/earth-s-mass-extinction-peter-ward
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.
Talk by Peter Ward.
Tagged under: \Peter Ward\,\Medea,Hyptothesis\,\Media,Hypothesis,Peter,Ward\,asteroid,Earth,\mass,extinction\,bacteria,\hydrogen,sulfide\
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