article_snippet: Barack Obama seized on the Lego page-turning device, which was being exhibited by Emily Bergenroth, Alicia Cutter, Karissa Cheng, Addy Oneal, and Emery Dodson.
article_snippet: Barack Obama lingered at the display by the so-called 'supergirl' team, who had made their invention partly out of Lego .
article_snippet: Learning: Corine Peifer, from Wallenpaupack, Pennsylvania, shows Barack Obama how to  make waves to illustrate Barack Obama solution to generate electricity from docks bobbing in the water .
article_snippet: Another one to try out: Barack Obama is pictured here testing a modified wheelchair made by Kaitlin Reed, 16, of Dover, Massachusetts and Mohammed Sayed, 16, of Cambridge, who is originally from Afghanistan .
article_snippet: Barack Obama's science adviser, John Holdren, joined the president during the tour of the displays, introducing the president to the young inventors and researches.
article_snippet: At each of the 12 display stations, Barack Obama quizzed the participants about each of the 12 display stations projects.
article_snippet: At one, Anvita Gupta, a 17-year-old from Scottsdale, Arizona, described the special algorithm Barack Obama had devised to identify other medical applications for existing drugs.
article_snippet: Barack Obama turned to the group of reporters and photographers trailing Barack Obama. '
article_snippet: This is what Barack Obama's been doing.'