The Origins of Humans

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Homo erectus emerged about two million years ago in africa, gradually developed into several archaic human species. We then started migrating out of africa, i think, about a hundred thousand years ago and got to know the neanderthals and denisevins. I would say that the very fact that we interbred with neandertals and denisivens shows that at least one of our deat by at least one definitions of species,. That we're all the same species. We're just different versions, different kinds of humans.

Thousands of years ago, humans crossed a land bridge from Siberia into Alaska. They tried to move south, but a two-mile-high, coast-spanning ice wall stood between them and the rest of the continent.

How did they get past it?

Scholars have fought over that question for decades. But in her book, “Origin,” Jennifer Raff says breakthroughs in genetics have given scientists an entirely new understanding of how the Americas were peopled and what happened in the millennia that followed.

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