Posted on July 23, 2020 9:45 am
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In Mexico, archaeologists excavating a cave at Zacatecas have unearthed stone tools as well as other evidence of the presence of prehistoric humans.

The researchers are confident that this is conclusive evidence that people lived in North America at least 30 thousand years ago, which is 15 thousand years earlier than previously thought.

An excavation report published in the journal Nature says artifacts, including 1,900 stone tools, indicate that humans