What if the most important discovery in human history wasn't made by us — but about us?

A finger bone smaller than your fingernail, found in a cave in Siberia, turned out to belong to an entirely unknown kind of human. This video traces how scientists led by Svante Pääbo identified the Denisovans from nothing but fragments of bone and strands of DNA, how a teenage girl named Denny turned out to be half Neanderthal and half Denisovan, and how a gene inherited from that vanished population still helps people breathe at extreme altitude today. It's the story of how the human family tree turned out to have knots in it — and how a piece of that history is likely still inside you.

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