Humans are thought to have reached the Americas less than 15,000 years ago. But evidence of stone tool use on an animal carcass excavated in California points to a much earlier arrival of human relatives from the genus Homo. See Letter p.479
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R. A. Cerutti/San Diego Nat. Hist. Mus.
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Hovers, E. Unexpectedly early signs of Americans. Nature 544, 420–421 (2017). https://doi.org/10.1038/544420a
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DOI: https://doi.org/10.1038/544420a
