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Barack Obama, Ruch Lyons, Victoria Flecther, Thomas Shields

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President Barack Obama, right, greets from left to right, Rush Lyons, 14, Victoria Fletcher, 13, and Thomas Shields, 13, all from Theodore, Alabama, before they demonstrate their robot 'Vator', which was designed to mimic a space elevator, Monday, April 22, 2013, at the White House Science Fair in the State Dining Room of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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