President Obama hugs a group of young girl scouts who presented their project at the 2015 White House Science Fair

President Barack Obama hugs Emily Bergenroth, Alicia Cutter, Karissa Cheng, Addy O’Neal, and Emery Dodson, all six-year-old Girl Scouts, from Tulsa, Oklahoma after viewing their science exhibit during the 2015 White House Science Fair celebrating student winners of a broad range of science, technology, engineering, and math (STEM) competitions, in the Red Room, March 23, 2015. The girls used Lego pieces and designed a battery-powered page turner to help people who are paralyzed or have arthritis. (Official White House Photo by Pete Souza)