President Barack Obama poses for a photo with Karen Fan, 17, left, and Felege Gebru, 18, both of Newton, Mass., as the president toured the 2014 White House Science Fair exhibits that are on display ... more 
President Barack Obama poses for a photo with Karen Fan, 17, left, and Felege Gebru, 18, both of Newton, Mass., as the president toured the 2014 White House Science Fair exhibits that are on display in the State Dining Room of the White House in Washington, Tuesday, May 27, 2014.Gebru and Fan showed Obama their pedestrian crossing signal. Obama was celebrating the student winners of a broad range of science, technology, engineering and math (STEM) competitions from across the country. (AP Photo/Susan Walsh) less 
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Associated Press | Photo By Susan Walsh
Tue, May 27, 2014 2:12 PM EDT