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Mexico cave stone tools hint Americans arrived much earlier, say 30,000 years ago

One of the limestone artefacts found at the site.Credit: Ciprian Ardelean

A massive haul of stone tools discovered in a cave in Mexico provide evidence that people occupied the area more than 30,000 years ago, suggesting that humans arrived in North America at least 15,000 years earlier than had been previously thought. The discovery is backed up by a separate statistical analysis incorporating data from sites in North America and Siberia. ...

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