Are These Footprints a Postcard From the Past?

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Sally Kohn: I would encourage listeners to pull up photos of the white sands footprints, write. These footprintsa spanned like two thousand years of sentiments and have been dated to between about 20, 23 thousand years ago. So let's talk about what that means for our models here in a minute. Skelton: Do you find yourself feeling kind of emotionally moved a when you encounter these discoveries? And do you feel a kinship with these first people?

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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