A farmer harvests corn on a farm near Spring Mills, Pa. According to current biofuel laws, if you burn ethanol from corn in your car, the government doesn't count the carbon dioxide that comes out of the tailpipe as an actual carbon emission. Carolyn Kaster/AP hide caption

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Wes Jackson, founder of the Land Institute, at his farm in Salina, Kan. Richard Harris hide caption

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This retinal prosthesis has been implanted in the eyes of 32 patients. The device receives wireless data from the camera which it then translates into electronic signals that are sent to the brain, restoring sight. Courtesy Second Sight Medical Products, Inc. hide caption

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The study tested classically trained violinists and pianists, and found that their brains were much better adapted to discern subtle pitch and tonal differences in sound. iStockphoto.com hide caption

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A snowy tree cricket feeds on a leaf from a mountain dalea plant. Gerardine Vargas hide caption

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Wild Sounds

Slo-Mo Cricket Chirps Reveal Secret Serenades

The slight differences in the patterns of cricket chirps are undetectable to the human ear, but may actually determine how crickets recognize their own kind.

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