WASHINGTON, DC – FEBRUARY 07: (AFP OUT) U.S. President Barack Obama (R) pumps the Extreme Marshmallow Cannon invented by Joey Hudy, 14, from Phoenix, Arizona, while touring student science fair projects on exhibit in the State Dining Room at the White House February 7, 2012 in Washington, DC. Obama hosted the second White House Science Fair celebrating the student winners of science, technology, engineering and math (STEM) competitions from across the country. (Photo by Molly Riley-Pool/Getty Images)