In this 2019 photo provided by Devlin A. Gandy, assistant professor Mikkel Winther Pedersen from the University of Copenhagen takes samples of cave sediments to look for DNA in Zacatecas, central Mexico. Artifacts from the site suggest people were living in North America much earlier than most scientists think. Researchers reported Wednesday, July 22, 2020, that tools found in the cave date to as early as 26,500 years ago, about 10,000 years before the generally accepted date for the earliest human presence in North America. (Devlin A. Gandy via AP)
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