Paleontologists have dug up a 130,000-year-old mastodon skeleton that looks like it was butchered by humans. But they found it in America, where people were not supposed to have arrived for another 100,000 years. Findings could upend our understanding of human history.

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Paleontologists have dug up a 130,000-year-old mastodon skeleton that looks like it was butchered by humans. But they found it in America, where people were not supposed to have arrived for another 100,000 years. Findings could upend our understanding of human history.