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.
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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.
