S46 E17: Paleontologists Discover New Mammal Fossils Hidden in Rocks

0:05:44 | Clip
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.


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