Disaster_Accident

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The crash scene of a heavy air tanker is seen from the air on June 4, 2012, near Hamblin Valley, Utah. The P2v Heavy air tanker crashed the previous day as it dropped retardant on a 5,000-acre wildfire, killing pilots Todd Neal Tompkins and Ronnie Edwin Chambless, both of Boise, Idaho. (Associated Press/The Deseret News)

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Debris from an MD-83 aircraft that crashed while approaching the airport in Lagos, Nigeria, on Sunday, June 3, 2012, is pictured on Monday. (AP Photo/Sunday Alamba)

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**FILE** Emergency personnel investigate the scene of a March 12, 2011, tour bus crash on Interstate 95 in the Bronx borough of New York. The crash killed 15 passengers. (Associated Press)

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Phase one of the New York Avenue Bridge project is nearing completion. Heavy train traffic under the bridge has limited the time workers are given to safely do reconstruction near the tracks. (Andrew Harnik/The Washington Times)

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The crash scene of a heavy air tanker is seen from the air on Monday near Hamblin Valley in Utah. The tanker crashed Sunday afternoon as it dropped retardant on a 5,000-acre wildfire, killing pilots Todd Neal Tompkins and Ronnie Edwin Chambless. (The Deseret News via Associated Press)

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This 2012 photo released by Mission: Allergy, Inc. shows a house dust mite as seen with an electron microscope, enlarged about 200 times. Experts say dust's constant accumulation has nothing to do with poor housekeeping. Dust is a naturally and continually forming collection of some pretty gross stuff. (AP Photo/Mission: Allergy)

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Brunswick High School students console each other June 4, 2012, at a crash site near Brunswick, Ohio. An 18-year-old boy died earlier that day, one day after he was thrown from a car in a crash just hours before his high school graduation. Three other teens were also killed. (Associated Press)

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Mason Hansen has been hauling away sand on his farm since the Missouri River flooded last year, and still has a long way to go before he can grow corn and soybeans again. "People don't have any idea how big of a mess this is," he said. (Associated Press)