Scientists working in Argentina have come across something that could shake up what we know about how early humans reached South America. Cut marks found on the bones of a giant, extinct armadillo relative suggest people were already living there roughly 20,000 years ago, way earlier than most researchers used to think. For years, the go to explanation was that the first humans got to the Americas by crossing a land bridge from Siberia into Alaska about 13,000 years ago. But over the past decade or so, a bunch of discoveries across both North and South America have started pushing that timeline back, and this find adds another piece to that puzzle.
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