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Last year, China banned the sale of commercial elephant ivory to stop poaching. That's when interest in ancient, buried woolly mammoth tusks boomed. Amos Chapple/RFE/RL hide caption

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Amos Chapple/RFE/RL

(Left) A close-up view of a spirally fractured mastodon femur. (Right) A boulder discovered at the Cerutti Mastodon site in San Diego County thought to have been used by early humans as a hammerstone. Tom Démeré/San Diego Natural History Museum hide caption

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Tom Démeré/San Diego Natural History Museum

New Evidence Suggests Humans Arrived In The Americas Far Earlier Than Thought

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Woolly mammoths depended on tiny flowering plants for protein. Did the decline of the flowers cause their extinction? Per Möller/Johanna Anjar hide caption

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Per Möller/Johanna Anjar

Woolly Mammoths' Taste For Flowers May Have Been Their Undoing

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A file photo from 2011 shows a man touching a giant bronze sculpture of a mammoth in the Siberian city of Khanty-Mansiysk. A team of Russian and South Korean scientists who found a well-preserved frozen woolly mammoth carcass this month say it also included blood. Natalia Kolesnikova/AFP/Getty Images hide caption

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Natalia Kolesnikova/AFP/Getty Images