Did a comet hit the Great Lakes region and fragment human populations 12,900 years ago?

Multi-institutional 26-member team of researchers propose a startling new theory: that an extraterrestrial impact, possibly a comet, set off a 1,000-year-long cold spell and wiped out or fragmented the prehistoric Clovis culture and a variety of animal genera across North America almost 13,000 years ago.

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<p><a href="http://www.physorg.com/news99134637.html">Did a comet hit the Great Lakes region and fragment human populations 12,900 years ago?</a></p> <p>Multi-institutional 26-member team of researchers propose a startling new theory: that an extraterrestrial impact, possibly a comet, set off a 1,000-year-long cold spell and wiped out or fragmented the prehistoric Clovis culture and a variety of animal genera across North America almost 13,000 years ago.</p>