John Limbert stepped down Friday as head of the State Department's Iran desk. In 1979, Limbert was one of 52 Americans taken hostage during the Islamic Revolution. He was held for more than a year. Brad Horn/NPR hide caption

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One of the negatives discovered by Rick Norsigian. Courtesy Rick Norsigian hide caption

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Ashton Stark stands next to his 1972 Volkswagen Beetle, which he converted into an electric car. Courtesy Noel Stark hide caption

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Pelicans rest on an oil retention boom near Grand Isle, La. Mario Tama/Getty Images hide caption

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Creek County in Oklahoma is so big, responding to a call can sometimes take a bit of research for Cpl. Allen Harwood. Gail Banzet/NPR hide caption

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Staff members at the Army Experience Center in Philadelphia demonstrate the Humvee interactive simulator in 2009. Matt Rourke/AP hide caption

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