President Barack Obama hosts the White House Science Fair in Washington

President Barack Obama pumps an Extreme Marshmallow Cannon invented by fourteen year old Joey Hudy (L) from Phoenix, Arizona, while touring student science fair projects on exhibt in the State Dining Room at the White House on February 7, 2012. Obama hosted the second White House Science Fair celebrating the student winners of science, technology, engineering and math (STEM) competitions from across the country. UPI/Molly Riley/Pool