US President Barack Obama blows a bubble using a bubble wand created with a 3D printer as he tours the 2016 White House Science Fair in the Blue Room at the White House in Washington, DC, April 13, 2016.
US President Barack Obama blows a bubble using a bubble wand created with a 3D printer as he tours the 2016 White House Science Fair in the Blue Room at the White House in Washington, DC, April 13, 2016.
