If it's true, it would be the oldest sign of humans in the Americas ever — predating the best evidence up to now by about 115,000 years. And the claim has scientists wondering whether to believe it....
http://www.npr.org/sections/thetwo-way/2017/04/26/525628056/new-evidence-suggests-humans-arrived-in-the-americas-far-earlier-than-thought?ft=nprml&f=1001
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