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S46 E17: Paleontologists Discover New Mammal Fossils Hidden in Rocks

Hidden inside ordinary-looking rocks, an astonishing trove of fossils paints a dramatic picture of how rat-sized creatures ballooned in size and began to evolve into the vast array of species—from cheetahs to bats to whales to humans—that rule our planet today.
Aired: 10/30/2019 | 0:05:44
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