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Overflowing water from a river floods a residential area in Nachikatsuura, Japan, on Sunday, Sept. 4, 2011. (AP Photo/Kyodo News)

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The emperor penguin nicknamed "Happy Feet," who washed up on a New Zealand shore two months ago, looks out of his temporary crate before his release into the Antarctic Ocean on Sunday, Sept. 4, 2011. (AP Photo/National Institute of Water and Atmospheric Research Ltd.)

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In this image released by New Zealand's National Institute of Water and Atmospheric Research Ltd., the wayward emperor penguin dubbed "Happy Feet" slides down a makeshift water slide into the Antarctic Ocean south of New Zealand as he is released from the NIWA research vessel Tangaroa on Sunday, Sept. 4, 2011. (AP Photo/NIWA)

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North Korean workers unload emergency flood aid sent from the United States at the Pyongyang airport in North Korea on Saturday, Sept. 3, 2011. The small but symbolic shipment of emergency aid for the flood-stricken North is the latest sign of a thaw in relations between the countries. (AP Photo/Associated Press Television News)

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Alabama Department of Transportation road crews clear debris from the road to Dauphin Island, Ala., early on Sunday, Sept. 4, 2011, as Tropical Storm Lee continued to meander along the Gulf Coast, bringing torrential rains and flooding. (AP Photo/Dave Martin)

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Former Alaska Gov. Sarah Palin greets supporters at The Machine Shed restaurant, in Urbandale, Iowa, Friday, Sept. 2, 2011. (AP Photo/Charlie Neibergall)

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Tropical Storm Irene caused road and building damage along Route 15 in New York, Thursday, Sept.1, 2011. Utility companies continue to bring New York electricity customers back on line, but almost 182,000 are still blacked out four days after Irene pounded the state with drenching rains and high winds. (AP Photo/Hans Pennink)

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**FILE** In this photo from June 15, 2011, Environmental Protection Agency (EPA) administrator Lisa Jackson testifies on Capitol Hill. (Associated Press)

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** FILE ** In this May 26, 2011, file photo, the Nuclear Regulatory Commission (NRC) headquarters is seen in Rockville, Md. The risk of an earthquake causing a severe accident at a nuclear power plant is up to 24 times greater than previously believed, according to an AP analysis of preliminary government data, and the nation’s nuclear regulator believes that a quarter of reactors may need modifications to make them safer. (AP Photo/Pablo Martinez Monsivais, File)

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ASSOCIATED PRESS Workers install safety netting at the Washington National Cathedral on Thursday after the landmark was damaged Aug. 23 by a 5.8-magnitude earthquake. A cathedral spokesman said no additional debris is expected to fall, adding that the netting is strictly a precautionary measure.

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A worker attaches a chain to a washed-out rail line in Phoenicia, N.Y., in the Catskill Mountains. Gov. Andrew Cuomo said Irene caused $1 billion in damage in New York, most of it from flooding upstate.

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In this Jan. 31, 2010 photo, a visitor inspects a Honda Motor Co.'s hybrid Fit at the Japanese automaker's headquarters in Tokyo. The Fit subcompact beat Toyota Motor Corp.'s Prius hybrid last month to top Japan's auto sales model rankings, its first return to that spot in nearly two years, the Japan Automobile Dealers Association said Friday, Feb. 4, 2011. (AP Photo/Koji Sasahara)

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Richmond American Homes is building 50 single-family homes on half-acre sites at Stonewall Manor in Triangle. The Amherst model, with 2,800 square feet, is priced from $419,950.

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This computer-generated graphic provided by NASA shows images of objects in Earth orbit that are currently being tracked. Space junk has made such a mess of Earth's orbit that experts say it may need to be cleaned up. (Associated Press/NASA)

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Paterson, N.J., firefighters suit up for a possible rescue on the city's Bridge Street as the swollen Passaic River floods on Wednesday, Aug. 31, 2011. (AP Photo/Rich Schultz)

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ASSOCIATED PRESS Vermont National Guardsmen load ready-to-eat meals and water for residents of Fair Haven on Wednesday. Vermont Emergency Management officials said all but one of the state's communities left isolated by flooding had been reached by ground crews as of Wednesday.

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Asian carp were on display at a Capitol Hill hearing last year about ways to prevent introduction of the invasive species into the Great Lakes. Now, six attorneys general have called for a wider push to protect the lakes from invasive species by cutting off their artificial link to the Mississippi River basin. (Associated Press)

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A produce store in Ship Bottom, N.J. lets customers know Hurricane Irene didn't knock it out of business. Shore towns recovering from the storm hope tourists weren't scared away for the remainder of the summer season. (Associated Press)

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Homeland Security Secretary Janet Napolitano (left) takes a helicopter tour Tuesday of hurricane damage to North Carolina with Gov. Beverly Perdue (center) and Sen. Kay R. Hagan. Also Tuesday, she said she wants the National Guard to stay on the U.S.-Mexico border. (Associated Press)

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A tattered American flag recovered from World Trade Center debris is part of the Smithsonian Institution's upcoming special display of 9/11 "relics," positioned on tables rather than from behind exhibit glass. (National Museum of American History)