US President Barack Obama (L) talks with a Girl Scout Brownie troop from Tulsa, Oklahoma about their design for a "flood proof" bridge, during the White House Science Fair at the White House in Washington, DC, May 27, 2014. The White House Science Fair celebrates the student winners of a broad range of science, technology, engineering and math (STEM) competitions from across the country. AFP PHOTO / Jim WATSON (Photo credit should read JIM WATSON/AFP via Getty Images)
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AFP JIM WATSON