Smithsonian

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This book cover image released by Smithsonian Books shows "The Smithsonian Book of Air & Space Trivia", edited by Amy Pastan. (AP Photo/Smithsonian Books)

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This undated handout photo provided by the National Air and Space Museum, Smithsonian Institution shows The Milestones of Flight Gallery, the main hall of the Smithsonian’s National Air and Space Museum, in Washington. For the first time since its 1976 opening, the Smithsonian's National Air and Space Museum plans to overhaul its central exhibition showing the milestones of flight. The extensive renovation announced Thursday will be carried out over the next two years with portions of the exhibit closing temporarily over time, said Museum Director J.R. "Jack" Dailey. (AP Photo/Eric Long, National Air and Space Museum, Smithsonian Institution)

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This photo provided by the Smithsonian National Zoo shows Giant panda cub Bao Bao outside with her mom Mei Xiang for the first time April 1, 2014, at the zoo in Washington. The zoo says Bao Bao tried out her climbing skills on one of the smaller trees and sat on the grass with a piece of bamboo. (AP Photo/Smithsonian National Zoo)

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Visitors look at (from top) the Monuments Men exhibit at the Smithsonian National Gallery of Art; an exhibit on villains from James Bond movies at the International Spy Museum; and the Anchorman exhibit at the Newseum. (andrew harnik/the washington times)