Mammoth bones and 'ghost' footprints add to heated debate about first humans in North America

Mammoth bones and ‘ghost’ footprints add to heated debate about first humans in North America

Mammoth bones and “ghost” footprints of ancient people are the latest evidence in a scientific debate about when the first humans reached the Americas.  The fossilized bones, in particular, could suggest people lived in North America tens of thousands of years before the generally accepted date for the arrival of the first Native Americans of …

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