Maria Hanes, 19, of Santa Cruz, Calif., left, has President Barack Obama pull back a cushioned helmet as Obama 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. Hanes was explaining how she developed a concussion cushion football helmet. 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)
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