WASHINGTON, DC - APRIL 22: (AFP OUT) U.S. President Barack Obama tries the bicycle-powered emergency water-sanitation station, created and presented by high schoolers Payton Karr (L) and Kiona Elliot (R) from Oakland Park, Florida, in the East Garden of the White House, during the White House Science Fair April 22, 2013 in Washington, DC. 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. The first White House Science Fair was held in late 2010. (Photo by Aude Guerrucci-Pool/Getty Images)
22 Apr 2013
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