White House Science Fair

President Barack Obama reacts as Joey Hudy of Phoenix, Arizona, launches a marshmallow from his Extreme Marshmallow Cannon in the State Dining Room of the White House during the second annual White House Science Fair on Feb. 7, 2012.

( Kevin Lamarque/Reuters )

President Barack Obama reacts as Joey Hudy of Phoenix, Arizona, launches a marshmallow from his Extreme Marshmallow Cannon in the State Dining Room of the White House during the second annual White House Science Fair on Feb. 7, 2012.

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