Earth's mass extinction - Peter Ward - TED-Ed

What this episode covers

View full lesson: http://ed.ted.com/lessons/earth-s-mass-extinction-peter-wardAsteroid 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. Learn more about your ad choices. Visit megaphone.fm/adchoices

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How long is this episode of TED-Ed?

This episode is 24 minutes long.

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This episode was published on May 31, 2026.

What is this episode about?

View full lesson: http://ed.ted.com/lessons/earth-s-mass-extinction-peter-wardAsteroid 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...

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