Japan Self-Defense Force officers in radiation protection suits hold a blue sheet over patients who were exposed to high levels of radiation at the Fukushima Dai-ichi nuclear power plant on March 25. A team of experts at Japan's National Institute of Radiological Sciences have helped treat injured workers. Jiji Press/AFP/Getty Images hide caption

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In his career, Manning Marable wrote about the struggle for equal rights — and especially the life of Malcolm X. In this file photo from 2001, he posed at his Columbia University office in New York. Mario Tama/Getty Images hide caption

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Cybex President Art Hicks says business is up strongly amid demand from overseas. The Medway, Mass., company makes exercise equipment for health clubs. Chris Arnold/NPR hide caption

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Richard Nixon, daughter Tricia and wife, Pat, board Air Force One after his resignation, Aug. 9, 1974. Bettmann/CORBIS hide caption

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Emergency vehicles leave the entrance to Massey Energy's Upper Big Branch coal mine in Montcoal, W.Va., on April 5, 2010, after a deadly explosion. Jeff Gentner/AP hide caption

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This shipping container was discovered upside down on the seafloor by researchers in June 2004, four months after it was lost at sea. Monterey Bay Aquarium Research Institute hide caption

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Camel owners wait for customers on the outskirts of Cairo on March 3. Tourism continues to suffer in Egypt following the uprising that forced President Hosni Mubarak to resign. Khaled Desouki/AFP/Getty Images hide caption

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President Obama participates in an AARP tele-town hall on health care in July 2009. The seniors group lobbied hard for the president's health care law. Now, Republicans say the group stands to make a healthy profit from the law. Haraz N. Ghanbari/AP hide caption

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