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21: Paleontologist Evelyn Vollmer, Figuring out the Age of the Earth, and What Defines a Dinosaur

Let's Learn Everything!

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The Rock Cycle Is the Cycle From Inigneous to Metaphysic to Sedimentary

The rock cycle makes life really difficult when you're trying to do radiometric dating. Arthur Holmes in 1946 was studying this, but he was like super, super criminally underfunded. And I think it's pretty awesome that he came up with this number because he was the first one to say three billion years old.

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