A Theory of Earth's Mass Extinctions

Paleontologist and astrobiologist Peter D. Ward studies the Cretaceous-Tertiary extinction event (the one that killed the dinosaurs) and other mass extinctions

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.

A Theory of Earth's Mass Extinctions


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