cave divers

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Diver Susan Bird working at the bottom of Hoyo Negro, a large dome-shaped underwater cave on Mexico’s Yucatán Peninsula. She carefully brushes the human skull found at the site while her team members take detailed photographs. Photograph: Paul Nicklen/National Geographic

Cave divers have discovered one of the oldest human skeletons yet found in North America. Near perfectly preserved, the bones yielded DNA that has hel(...)