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Main » 2011 » October » 25
If smart aliens exist, they may have visited Earth millions of years ago – and left signs of their technological prowess that should be cheap and easy for us to detect.
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Humans were hunting mastodons in what is now Washington state 13,800 years ago. The finding adds to the evidence that humans entered North America at least 800 years before the rise of the Clovis culture, long thought to have been the first Americans.
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