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Dancers Adrianne Haslet-Davis and Christian Lightner at TED2014

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April 11, 2014 10:39 AM EDT A year after losing her ankle and foot during the Boston Marathon bombing, dancer Adrianne Haslet-David performs with Christian Lightner during a TED Talk by MIT professor Hugh Herr. Herr, who lost both of his legs in a climbing accident 30 years ago, designed the custom bionic leg that allows Haslet-Davis to continue to dance. (Lauren McEwen / The Washington Post)

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