Disaster_Accident

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Rockets propelled by RD-180 engines transport U.S. national security satellites to space. (Associated Press) ** FILE **

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Abby Brockway waves from atop a tripod erected on train tracks to a pair of engines passing on an adjacent track Tuesday, Sept. 2, 2014, in Everett, Wash. About a dozen demonstrators blocked the tracks at a Burlington Northern Santa Fe yard to protest oil and coal export terminals in the Northwest. (AP Photo/Elaine Thompson)

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An artist's rendering of what Boeing's Phantom Swift X-Plane will look like upon completion. (Image: Boeing)

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President Obama signed the Fair Pay and Safe Workplace executive order, affecting how contractors do business with the federal government. (Associated Press/File)

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Denver Broncos strong safety Duke Ihenacho (33) kneels in the end zone before playing against the San Diego Chargers in an NFL football game, Thursday, Dec. 12, 2013, in Denver. (AP Photo/Jack Dempsey)

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Washington Redskins quarterback Robert Griffin III is tackled by Denver Broncos strong safety Duke Ihenacho (33) during an NFL football game Sunday, Oct. 27, 2013, in Denver. (AP Photo/Jack Dempsey)

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U.S. Air National Guard Col. James Keefe, commander of the 104th Fighter Wing, said at a news conference Wednesday that there were no munitions onboard the jet that crashed Wednesday into a mountain in Virginia. The plane was flying at about 30,000 to 40,000 feet when the pilot reported the emergency. (AP Photo/Steven Senne)

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National Transportation Safety Board investigator Tom Latson takes notes in front of the wreckage from a twin engine aircraft in Las Cruces, N.M., Thursday, Aug. 28, 2014. Four people died when the medical transport airplane that was transporting a cancer patient to Phoenix, Arizona, crashed and burst into flames shortly after takeoff from Las Cruces Airport Wednesday. (AP Photo/Juan Carlos Llorca)

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Denver Broncos quarterback Peyton Manning (18) talks to Houston Texans strong safety D.J. Swearinger (36) after a Broncos touchdown during the first half of an NFL preseason football game, Saturday, Aug. 23, 2014, in Denver. Manning was whistled for taunting. (AP Photo/Joe Mahoney)

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The exterior of the Internal Revenue Service building in Washington. The agency has been under fire for what critics say are politically motivated attacks against conservative organizations. (Associated Press)

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Winemaker Tom Montgomery stands in wine and reacts to seeing damage following an earthquake at the B.R. Cohn Winery barrel storage facility Sunday, Aug. 24, 2014, in Napa, Calif. Winemakers in California’s storied Napa Valley woke up to thousands of broken bottles, barrels and gallons of ruined wine as a result of Sunday’s earthquake. (AP Photo/Eric Risberg)

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This photo provided by Lyall Davenport shows damage to a building in Napa, Calif. early Sunday, Aug. 24, 2014. Officials say an earthquake with a preliminary magnitude of 6.0 has been reported in California's northern San Francisco Bay area. (AP Photo/Lyall Davenport)

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** FILE ** A column of ash rises from Iceland's Eyjafjallajokul volcano, May 8, 2010. (AP Photo/ APTN) **

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as approximately 30 people gather outside the White House as part of a national â€œDay of Rageâ€ organized by the group "Anonymous" over the fatal police shooting of an unarmed black teen earlier this month in Ferguson, Missouri, Washington, D.C., Thursday, August 21, 2014. (Andrew Harnik/The Washington Times)

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as approximately 30 people gather outside the White House as part of a national â€œDay of Rageâ€ organized by the group "Anonymous" over the fatal police shooting of an unarmed black teen earlier this month in Ferguson, Missouri, Washington, D.C., Thursday, August 21, 2014. (Andrew Harnik/The Washington Times)

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as approximately 30 people gather outside the White House as part of a national â€œDay of Rageâ€ organized by the group "Anonymous" over the fatal police shooting of an unarmed black teen earlier this month in Ferguson, Missouri, Washington, D.C., Thursday, August 21, 2014. (Andrew Harnik/The Washington Times)

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The Hetch Hetchy Valley was flooded in 1923 to provide Bay Area residents with water. Some say restoring the valley will allow other parts of the state to share in the wealth. (associated press)