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May 4, 2016

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Eight-year-old Steele Songle, left, smiles at his mother Ellen after trying on an artificial hand designed by engineering students at Westtown High School, April 18, 2014, in West Chester, Pa.

Ron Tarver / Philadelphia Inquirer/MCT

Eight-year-old Steele Songle, left, smiles at his mother Ellen after trying on an artificial hand designed by engineering students at Westtown High School, April 18, 2014, in West Chester, Pa.