'Cosmos' recap: Permian period and 'The Lost Worlds of Planet Earth'

When most of us think about extinction, chances are we recall that infamous asteroid that killed off the dinosaurs 66 million years ago – a.k.a., the K/T extinction event. This week's episode of "Cosmos": "The Lost Worlds of Planet Earth," takes us back 252 million years, to another, far worse mass extinction that wiped out nine out of 10 of all living species at the end of what's known as the Permian period.  Read More...



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