Denisova Cave: Finding a Ghost Lineage

In 2010, scientists sequenced DNA from a tiny pinky bone fragment found in Siberia's Denisova Cave. The result was shocking: the DNA belonged to neither a modern human nor a Neanderthal, but to a previously unknown group of archaic humans, now called 'Denisovans.' This find proved that multiple human species coexisted and interbred, forever changing the story of who we are.