President Barack Obama talks with Brownies from Girl Scout Troop 2612 from Tulsa, Okla., during the 2014 White House Science Fair

President Barack Obama talks with Brownies from Girl Scout Troop 2612 from Tulsa, Okla., during the 2014 White House Science Fair in the Blue Room of the White House, May 27, 2014. The fair celebrates the student winners of a broad range of science, technology, engineering and math (STEM) competitions from across the country. The girls invented the "Flood Proof Bridge."