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Dr. Wayne Clough, Secretary, Smithsonian Institution, speaks during the Welcome Discovery Ceremony at the Smithsonian's Udvar-Hazy National Air and Space Museum's annex on April 19, 2012.   Mike Lynaugh

Dr. Wayne Clough, Secretary, Smithsonian Institution, speaks during the Welcome Discovery Ceremony at the Smithsonian's Udvar-Hazy National Air and Space Museum's annex on April 19, 2012.

Mike Lynaugh