Drew Schwartzman, left, 5, of Baltimore, Md., and Alexander Leigh, 3, of Round Hill, Va., play with toy shuttles outside the Smithsonian Air and Space Museum's Udvar-Hazy Center in Chantilly, Va., on Tuesday, April 17, 2012 as they wait for the space shuttle Discovery to fly by on its way to Washington Dulles International Airport. (Barbara L. Salisbury/The Washington Times)
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