WASHINGTON, DC - MAY 27:  U.S. President Barack Obama looks at the project of Peyton Roberston (L) from Ft. Lauderdale, Florida, winner of the Discovery 3M Young Scientist, for his "Sandless sand bags" project, during the  2014 White House Science Fair at the White House May 27, 2014 in Washington DC. The fair celebrates the winners of STEM (science, technology, engineering and math) competitions across the country.  (Photo by Aude Guerrucci-Pool/Getty Images)