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The Peopling of South America

"In 2007, while searching for signs of ancient human inhabitants of the Andes mountain range, more than 4,300 meters above sea level, Kurt Rademaker came across a field littered with chunks of obsidian—some of them fashioned into tools. “There were hundreds and hundreds of them,” recalls Rademaker, then a graduate student at the University of Maine. “Adjacent to this open-air workshop, just up above it on the hillside, was a beautiful rock shelter. . . . I just had a gut feeling that it was the kind [of site] I had been looking for.” 

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