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People walk outside the hospital where Colombian Nobel Literature laureate Gabriel Garcia Marquez is being treated in Mexico City, Thursday, April 3, 2014. Garcia Marquez was hospitalized with lung and urinary tract infections that are responding to treatment, federal health officials and the author's son said Thursday. (AP Photo/Marco Ugarte)

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FILE - In this May 7, 1953, file photo, Navajo miners work at the Kerr McGee uranium mine at Cove, Ariz., on the Navajo reservation in Arizona. Kerr-McGee left abandoned uranium mine sites, including contaminated waste rock piles, in the Lukachukai mountains of Arizona and in the Ambrosia Lake area of New Mexico. The Lukachukai mountains are located immediately west of Cove, Ariz., and are a culturally significant part of the Navajo Nation. This site is among thousands that are part of the $5.15 billion settlement with Anadarko Petroleum Corp. with approximate amount of funding for cleanup efforts and details about the sites, in information provided by the Justice Department. (AP Photo)

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FILE - In this April 26, 2004 aerial file photo, shows the smoldering remains from an explosion April 23 at the Formosa Chemical Plant in Illiopolis, Ill., that killed five people. The former plastics plant in central Illinois is now all but demolished and cleaned up according to Illinois state environmental regulators. (AP Photo/State Journal Register, T.J. Salsman, File)

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An Atlas 5 rocket is launched at Vandenberg Air Force Base from Space Launch Complex-3 on Thursday, April 3, 2014. A United Launch Alliance Atlas V rocket carrying the 19th Defense Meteorological Satellite Program spacecraft blasted off at 7:46 a.m. PDT and quickly rose into the cold, clear sky above the launch site on the Pacific coast about 130 miles northwest of Los Angeles. The satellite will circle the Earth in a polar orbit at an altitude of about 525 miles (847 kilometers). (AP Photo/The Santa Maria Times, Daniel Dreifuss)

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spectators and media watch as an Atlas 5 rocket launches from Vandenberg Air Force Base from Space Launch Complex-3 on Thursday, April 3, 2014. A United Launch Alliance Atlas V rocket carrying the 19th Defense Meteorological Satellite Program spacecraft blasted off at 7:46 a.m. PDT and quickly rose into the cold, clear sky above the launch site on the Pacific coast about 130 miles northwest of Los Angeles. The satellite will circle the Earth in a polar orbit at an altitude of about 525 miles (847 kilometers). (AP Photo/The Santa Maria Times, Daniel Dreifuss)

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An Atlas 5 rocket launches from Vandenberg Air Force Base from Space Launch Complex-3 on Thursday, April 3, 2014. A United Launch Alliance Atlas V rocket carrying the 19th Defense Meteorological Satellite Program spacecraft blasted off at 7:46 a.m. PDT and quickly rose into the cold, clear sky above the launch site on the Pacific coast about 130 miles northwest of Los Angeles. The satellite will circle the Earth in a polar orbit at an altitude of about 525 miles (847 kilometers). (AP Photo/The Santa Maria Times, Daniel Dreifuss)