Some of the most interesting discoveries in archaeology come from sifting through ancient garbage dumps. Scientists working in Oregon have found one that has yielded what they say are the oldest human remains in the Americas and a puzzle about the earliest American tools.

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And the scientists now have reliable dates for all this stuff. Some of the coprolites appear to be 14,500 years old. They say it's the oldest direct evidence of people in America, because it's based on carbon dating o...
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