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dracodraconisStudy links mammoth extinction, comets - USATODAY.com
 A study published in the journal Science links nanodiamond crystals found at six sites around North America to a comet swarm that may have struck the earth 12,900 years ago, resulting in a continent-wide wildfire that brought the North-American megafauna and the Clovis people to extinction, as well as triggering an ice age. The proposal is not completely accepted by scientists who suggest that further study is required. |