For centuries, Russians believed putting a brown frog in their milk would keep it fresh. Now scientists are finding chemicals in the frog's slimy goo that inhibit the growth of bacteria and fungi. Stefan Arendt/Corbis hide caption

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Moss and a cup fungus growing amid the decomposing leaves of Shakerag Hollow in Sewanee, Tennessee. Courtesy of David Haskell hide caption

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Kids' Sugar Cravings Might Be Biological

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