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Vehicles transporting North Korean missiles on display over the weekend were made or designed by China, analysts say. Meanwhile, a propaganda billboard in Pyongyang translates as "Let's raise the spirits of winners and build a strong and prosperous nation!" North Korea has yet to launch a multistage missile successfully. (Associated Press)

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**FILE** New homes are seen March 23, 2012, under construction in a development in Atlanta. (Associated Press)

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The NASA Space Shuttle Discovery sits on a road prior to a welcoming ceremony at the Smithsonian's National Air and Space Museum annex in Chantilly, Va., on April 19, 2012. (Rod Lamkey Jr./The Washington Times)

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The NASA Space Shuttle Discovery sits on a road prior to a welcoming ceremony at the Smithsonian's National Air and Space Museum annex in Chantilly, Va., on April 19, 2012. (Rod Lamkey Jr./The Washington Times)

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D.R. Horton is building 29 single-family homes on 7,000-square-foot sites at Sherwood Forest in Haymarket. The Yorktown model, with 2,212 square feet, is priced from $359,990.

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Jonathan Blum, deputy administrator for Medicare, said a yearlong competitive-bidding program targeting waste and fraud has been a "clear success." (Department of Health and Human Services via Associated Press)

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**FILE** A University of Phoenix billboard is shown Nov 24, 2009, in Chandler, Ariz. (Associated Press)

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Rep. Don Young, Alaska Republican, stood up for wounded veterans who killed polar bears in Canada but have been unable to bring carcasses into the U.S. (Associated Press)

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A month after Haiti's January 2010 earthquake, Angelina Jolie visits at MSF Hospital in Port-au-Prince with a 10-year-old boy who lost a leg in the quake. The actress is a United Nations special envoy for refugees. (United Nations High Commissioner for Refugees via Associated Press)

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Robert Peck, the former public buildings service commissioner at the General Services Administration, testifies on Capitol Hill in Washington on Tuesday, April 17, 2012, before the House Economic Development, Public Buildings and Emergency Management subcommittee hearing. (AP Photo/J. Scott Applewhite)

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Mechanic Doug Isonio works on parts for a Bay Area Rapid Transit subway train at the system's maintenance yard. BART still uses 449 of its original 669 cars from 1972, but circuit boards and other electrical components are no longer manufactured, so employees scour eBay and cannibalize some cars for parts. (Associated Press)

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Gas prices flying past $4 a gallon have played a big part in a surge in sales of hybrid and electric cars, including the Chevrolet Volt. In March, General Motors Co. set a monthly sales record of 2,289 for the Volt, an electric car with a small backup gas engine. It sold just 7,671 Volts last year. (Associated Press)

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Sue Lord is dwarfed by the debris from her home, which is piled up on her neighbor's home, following a tornado in Woodward, Okla., on Sunday, April 15, 2012. Ms. Lord was in the home when the tornado struck but was not injured. (AP Photo/Sue Ogrocki)

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Mist covers the city of Pyongyang, North Korea on Friday, April 13, 2012. North Korea fired a long-range rocket early Friday, South Korean defense officials said, defying international warnings against a launch widely seen as a provocation. (AP Photo/David Guttenfelder)

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In this photo taken on 13 March 2012, an African rhinoceros is seen at a private zoo of Bao Son Paradise Park in Hanoi, Vietnam, which has 24-hour security to protect against potential poachers. Wildlife conservationists warn that VietnamÃs surging demand for rhino horn, which is believed to treat everything from hangovers to cancer, is threatening to wipe out the worldÃs remaining rhino populations. Illegal killings in Africa hit a record high in 2011 and are expected to worsen this year. (AP Photo/Na Son Nguyen)