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Megabeasts' Sudden Death Megabeasts' Sudden Death

Did a comet wipe out North America's mammoths and other megafauna? Evidence in support of such a catastrophe, experts say, has turned up in such disparate places as Arizona (top, where geophysicist Allen West digs into the black layer he says marks the time it happened) and Greenland (bottom, where glacier expert Andrei Kurbatov digs for microscopic particles that may have originated during the supposed comet strike).


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