Why Are We the Only Human Species Left?

Fifty thousand years ago, you could meet five different kinds of humans. Stronger ones. Tiny ones. One known from a single finger bone. Today there's only us, so what happened to everyone else? From Neanderthals to Denisovans to the hobbits of Flores, this is the story of the family we lost, and the DNA of theirs still inside you. Subscribe to Infinity Random Facts, a new story from deep history every week.