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Clip: Season 46 Episode 17 | 5m 44s | Video has closed captioning.
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: 10/30/19
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