S2 E7 The Clean Room

To determine the true age of the Earth, geochemist Clair Patterson developed the uranium-lead dating method to make an unprecedented discovery.... More

Cosmos: A SpaceTime Odyssey Episodes (12)

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S2 E1 Standing Up in the Milky Way
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S2 E2 Some of the Things That Molecules Do
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S2 E3 When Knowledge Conquered Fear
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S2 E4 A Sky Full of Ghosts