Gentex Corp.'s rearview mirror camera display enables drivers to see objects and people behind the vehicle using a tiny camera mounted to the back of the car. Courtesy of Gentex Corp. hide caption

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TV and radio host Glenn Beck targeted Frances Fox Piven as an "enemy of the Constitution." Death threats soon followed. Jose Luis Magana/AP hide caption

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The cast of the TV show Glee sells Chevys in this Super Bowl ad. YouTube hide caption

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A farmer harvests a corn crop near Monticello, Ill., last September. The price of wheat and corn jumped 70 percent in the second half of 2010. Seth Perlman/AP hide caption

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