An artist's impression shows a planet, right, orbiting the star Alpha Centauri B, center, a member of the triple star system that is the closest to Earth. ESO/L. Calcada/AP hide caption

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When a case of the potentially lethal H5N1 bird flu was found in British poultry in 2007, Dutch farmers were told to keep their poultry away from wild birds by closing off outdoor areas with wire mesh. Ed Oudenaarden/AFP/Getty Images hide caption

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Polar bears in the Beaufort Sea in northern Alaska. Scientist Charles Monnett caused a stir with a 2006 report on polar bears that were drowning, apparently owing to a lack of ice. Steve Amstrup/Fish and Wildlife Service hide caption

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NASA says it has found proof that water shaped the rocks on the left, in a photograph taken by the Mars rover Curiosity (left). For comparison, the agency released an image of rocks from Earth (right). NASA hide caption

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The African spiny mouse has the ability to regrow large patches of skin and hair without scarring. Ashley W. Seifert/Nature hide caption

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Federally funded chimps at the New Iberia Research Center in Louisiana will retire to either a lab in Texas or a chimp sanctuary in Louisiana. Courtesy of the Humane Society of the United States hide caption

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Space shuttle Endeavour is towed to the Kennedy Space Center landing facility in Cape Canaveral, Fla., on Friday. John Raoux/AP Photo hide caption

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The two Voyager spacecraft launched on Aug. 20 and Sept. 5, 1977, on a mission to explore Jupiter and Saturn. This true-color image, captured by Voyager 2 on July 21, 1981, shows the moons Dione (small dot at left) and Rhea (lower right) near Saturn. NASA/JPL hide caption

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A rhesus monkey eats watermelon, provided by zookeepers, at the Kamla Nehru Zoological Gardens in India in May 2012. Sam Panthaky/AFP/Getty Images hide caption

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Generating artificial lightning in Nikola Tesla's laboratory. Bettmann/Corbis hide caption

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A school of Blue Tang fish swimming together off the Caribbean island of Bonaire. It has long been assumed that the schooling behavior of fish evolved in part to protect animals from being attacked by predators. David J. Phillip/AP hide caption

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