President Barack Obama talks with Sergio Corral and Isela Martinez while viewing science exhibits during the 2015 White House Science Fair celebrating student winners of a broad range of science, technology, engineering, and math (STEM) competitions, in the State Dining Room, March 23, 2015. The two 17-year-old students are current leaders of the robotics program from Carl Hayden High School in Phoenix, Ariz., which was chronicled in the recent documentary "Underwater Dreams" where their under-served high school beat out MIT and other colleges in an underwater robotics competition.