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The little original mammoth Lyuba is shown at the neanderthal museum in Mettmann, western Germany, Friday, Nov. 19, 2010. The mammoth baby died 40.000 years ago in the mud, where it was conservated in the ice. A new exhibiton shows the giants of the ice age in the famous valley, where the 44.000 years old neanderthal man was found. (AP Photo/Martin Meissner)

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In this undated aerial photo provided by Pike River Coal is the Pike River Coal Processing Plant near the town of Atarau on the west coast of New Zealand's South Island. An explosion ripped through the coal mine on Friday, Nov. 19, 2010, and around 30 workers were unaccounted for, police and the mining company said. (AP Photo/Pike River Coal via New Zealand Herald)

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A boy reacts to the effects of tear gas fired by police and UN soldiers during a protest in an area where displaced earthquake survivors live in Port-au-Prince, Haiti, Thursday, Nov. 18, 2010. Following days of rioting in northern Haiti over suspicions that U.N. soldiers introduced a cholera epidemic that has killed more than 1,000 people, protesters in Haiti's capital clashed with police Thursday lashing out at U.N. peacekeepers and the government, blocking roads and attacking foreigners' vehicles. (AP Photo/Emilio Morenatti)

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Presidential candidate and singer Michel "Sweet Micky" Martely gestures during a campaign rally in Croix-Des-Bouquets, Haiti, Friday, Nov 12, 2010. Less that two weeks to go before the election, a rapidly spreading cholera outbreak is infecting even the presidential campaign.(AP Photo/Dieu Nalio Chery)

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In this artist rendering provided by the Philadelphia Eagles and Solar Blue on Thursday, Nov. 18, 2010, Lincoln Financial Field in Philadelphia is shown after it undergoes renovations that will make the stadium self-sufficient and let the Eagles sell some power back to the electric grid. (AP Photo/The Philadelphia Eagles and Solar Wind)

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This image provided by NASA shows a Nov. 4, 2010 image from NASA's EPOXI mission spacecraft showing part of the nucleus of comet Hartley 2. The sun is illuminating the nucleus from the right. A distinct cloud of individual particles is visible. Scientists say a NASA spacecraft braved a cosmic ice storm during this recent flight past the comet Hartley 2.(AP Photo/NASA)

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** FILE ** In this April 2006 file photo photo provided by Earthjustice, a false killer whale is seen leaping while chasing prey in waters off Hawaii. The federal government said Tuesday it will recommend that a small population of dolphins living near Hawaii be placed on the endangered species list. Only about 150 or 170 of the dolphins, known as false killer whales, live in waters up to 87 miles off Hawaii's coasts. (AP Photo/Robin Baird, Earthjustice, File)

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FILE - In this June 14, 2010 file photo, Hayabusa probe asteroid exploration project manager Junichiro Kawaguchi speaks with a scale model of the asteroid Itokawa, foreground, during a press conference at Japan Aerospace Exploration Agency (JAXA) in Sagamihara, near Tokyo. The Hayabusa's capsule that returned to Earth in June successfully after a seven-year, 4 billion-mile (6 billion-kilometer) journey captured dust from an asteroid for the first time in history, scientists said Tuesday, Nov. 16, 2010. (AP Photo/Itsuo Inouye, File)

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FILE - In this June 14, 2010 file photo released by the Japan Aerospace Exploration Agency (JAXA), a technician examines a sampler capsule that was detached from JAXA's Hayabusa probe, the first spacecraft to complete a seven-year, 4-billion mile (6-billion kilometer) round-trip journey to an asteroid, in a desert in the Woomera Prohibited Area, southern Australia. The Hayabusa's capsule that returned to Earth in June successfully captured dust from the asteroid for the first time in history, scientists said Tuesday, Nov. 16, 2010. (AP Photo/Japan Aerospace Exploration Agency, File)

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A demonstrator stands next to burning tires during a protest in Port-au-Prince, Haiti, Thursday, Nov. 18, 2010. Following days of rioting in northern Haiti over suspicions that U.N. soldiers introduced a cholera epidemic that has killed more than 1,000 people, protesters in Haiti's capital clashed with police Thursday lashing out at U.N. peacekeepers and the government, blocking roads and attacking foreigners' vehicles. (AP Photo/Emilio Morenatti)

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A UN peacekeeper from Brazil shoots tear gas to demonstrators during a protest in Port-au-Prince, Haiti, Thursday, Nov. 18, 2010. Following days of rioting in northern Haiti over suspicions that U.N. soldiers introduced a cholera epidemic that has killed more than 1,000 people, protesters in Haiti's capital clashed with police Thursday lashing out at U.N. peacekeepers and the government, blocking roads and attacking foreigners' vehicles. (AP Photo/Ramon Espinosa)

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A demonstrator runs to avoid tear gas fired by police and UN soldiers during a protest in Port-au-Prince, Haiti, Thursday, Nov. 18, 2010. Following days of rioting in northern Haiti over suspicions that U.N. soldiers introduced a cholera epidemic that has killed more than 1,000 people, protesters in Haiti's capital clashed with police Thursday lashing out at U.N. peacekeepers and the government, blocking roads and attacking foreigners' vehicles. (AP Photo/Ramon Espinosa)

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Demonstrators shout slogans during a protest in Port-au-Prince, Haiti, Thursday, Nov. 18, 2010. Following days of rioting in northern Haiti over suspicions that U.N. soldiers introduced a cholera epidemic that has killed more than 1,000 people, protesters in Haiti's capital clashed with police Thursday lashing out at U.N. peacekeepers and the government, blocking roads and attacking foreigners' vehicles. (AP Photo/Emilio Morenatti)

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Demonstrators run past burning tires during a protest in Port-au-Prince, Haiti, Thursday, Nov. 18, 2010. Following days of rioting in northern Haiti over suspicions that U.N. soldiers introduced a cholera epidemic that has killed more than 1,000 people, protesters in Haiti's capital clashed with police Thursday lashing out at U.N. peacekeepers and the government, blocking roads and attacking foreigners' vehicles. (AP Photo/Emilio Morenatti)

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An UN peacekeepers from Brazil falls from his vehicle next to demonstrators during a protest in Port-au-Prince, Haiti, Thursday, Nov. 18, 2010. Following days of rioting in northern Haiti over suspicions that U.N. soldiers introduced a cholera epidemic that has killed more than 1,000 people, protesters in Haiti's capital clashed with police Thursday lashing out at U.N. peacekeepers and the government, blocking roads and attacking foreigners' vehicles (AP Photo/Emilio Morenatti)

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Demonstrators set up a barricade during a protest in Port-au-Prince, Haiti, Thursday, Nov. 18, 2010. Following days of rioting in northern Haiti over suspicions that U.N. soldiers introduced a cholera epidemic that has killed more than 1,000 people, protesters in Haiti's capital clashed with police Thursday lashing out at U.N. peacekeepers and the government, blocking roads and attacking foreigners' vehicles. (AP Photo/Emilio Morenatti)

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Women collect water next to their tents in a refugee camp in Port-au-Prince, Haiti, Wednesday, Nov. 17, 2010. A month-old cholera epidemic in Haiti has killed at least 1,000 people and hospitalized thousands.(AP Photo/Emilio Morenatti)

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earthquake refugees react after receiving tear gas during a protest in Port-au-Prince, Haiti, Thursday, Nov. 18, 2010. Following days of rioting in northern Haiti over suspicions that U.N. soldiers introduced a cholera epidemic that has killed more than 1,000 people, protesters in Haiti's capital clashed with police Thursday lashing out at U.N. peacekeepers and the government, blocking roads and attacking foreigners' vehicles. (AP Photo/Ramon Espinosa)

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U.S. Sen. Lisa Murkowski greets supporters at the Laborers International Hall, Wednesday, Nov. 17, 2010 in Anchorage, Alaska (AP Photo/Michael Dinneen)

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FILE - In this Oct. 28, 2010, file photo, former Alaska Gov. Sarah Palin campaigns for Senate candidate Joe Miller, left in Anchorage, Alaska. Sen. Lisa Murkowski's stunning write-in victory was a political poke in the eye to Alaska's other favorite daughter, Sarah Palin. (AP Photo/Rob Stapleton)