Will science eventually catch up to tribal origin stories? A new book, Atlas Of A Lost World, author Craig Childs finds the "first arrivals keep getting older and older because we’re finding more evidence as time goes on. Right now we can solidly say that people were across the Americas by 15,000 years ago. But that means people were probably already well in place by then; and there’s enough evidence to suggest humans were widespread 20,000 years ago."

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