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Cosmic blast may have killed off megafauna
Scientists say early humans doomed, too
Wooly mammoths, giant sloths, saber-toothed cats, and dozens of other species of megafauna may have become extinct when a disintegrating comet or asteroid exploded over North America with the force of millions of hydrogen bombs, according to research by an international team of scientists. (Full article: 685 words)
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