Scientists have discovered the oldest footprint ever found in the Americas, dating back some 15,600 years. It was found in Patagonia near a controversial, ancient human site. If confirmed, it's another blow to the idea humans reached the Americas just 13,500 years ago via the Beringia land bridge.

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Scientists have discovered the oldest footprint ever found in the Americas, dating back some 15,600 years. It was found in Patagonia near a controversial, ancient human site. If confirmed, it's another blow to the idea humans reached the Americas just 13,500 years ago via the Beringia land bridge.