WASHINGTON, DC - APRIL 22:  (AFP OUT) U.S. President Barack Obama  speaks with Google Global Science Fair Grand Prize winner, Brittany Wenger from Sarasota, California, in the  State Dining Room of the White House during the White House Science Fair April 22, 2013 in Washington, DC.  Brittany Wenger developed a computer program that improves cancer detection.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)