Cows that consume feed, grass or water contaminated with radioactive iodine-131 can concentrate the element in their milk. Peter Elvidge/ hide caption

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The facilities at the Fukushima Dai-ichi nuclear power plant were designed to withstand strong earthquakes and tsunamis, but not to the strength and size experienced on March 11. Air Photo Service/AP hide caption

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Libyan Foreign Minister Moussa Koussa speaks during a press conference in Tripoli on March 19. Koussa arrived in Britain on March 30, and told the British government that he was resigning from his post. Mahmud Turkia/AFP/Getty Images hide caption

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Annica Trotter prepares for a day at work at her new job as a receptionist. Tamara Keith/NPR hide caption

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In some parts of the country, like San Diego (above), gas prices are above $4 a gallon. Some Republicans are trying to tie those higher prices at the pump to President Obama's energy policies. Gregory Bull/AP hide caption

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Tea Party supporters hold signs across from a rally held by the American Federation of State, County and Municipal Employees in front of the Maryland State Capitol building in Annapolis on March 14. Mark Wilson/Getty Images hide caption

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The range of products and services sold on are expanding quickly as part of CEO Jeff Bezos' vision for the Internet retailer. Karen Bleier/AFP/Getty Images hide caption

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Militiamen loyal to Laurent Gbagbo patrolled the empty streets of Abidjan on Thursday as forces loyal to Alassane Ouattara approached the city. Jean-Phillippe Ksiazek/AFP/Getty Images hide caption

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Firefighters use heavy equipment to tear apart a collapsed 300-year-old house while searching for the dead in the rubble of Rikuzentakata, Japan. John Burnett/NPR hide caption

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Monty has been certified as a therapy dog in both the U.S. and the U.K., where he formerly worked as a rat-catcher in a horse barn. Courtesy of Yale University hide caption

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