Archeologists are seriously considering the theory that a cometary impact about 11,000 BCE depopulated much of the Americas (Economist.com). If true, one wonders what the Clovis people might have achieved but for that impact. Would they have "discovered" Europe?
Some animals survived, and perhaps a few humans. We should learn much more in the next year or two.
I wonder if the Chinese will start scanning space for incoming comets. Maybe this sort of thing is not so infrequent as once thought ...
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