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North America was once home to mammoths, mastodons (above) and beavers the size of black bears. Barry Roal Carlsen/University of Wisconsin-Madison hide caption

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Barry Roal Carlsen/University of Wisconsin-Madison

Sounds During Sleep May Help You Remember

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A close-up composite image of a dust particle. The green patches contain bromine, calcium and/or iron. Courtesy of American Chemical Society hide caption

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Courtesy of American Chemical Society

The Dirt On Dust

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