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

itoggle caption Carolyn Kaster/AP

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

itoggle caption Richard Harris

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

itoggle caption Courtesy Second Sight Medical Products, Inc.

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

itoggle caption iStockphoto.com

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

itoggle caption Gerardine Vargas