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Man with 'bionic' leg to climb Chicago skyscraper
USA TODAY
Zac Vawter, fitted with an experimental "bionic" leg, looks down from the Ledge at the Willis Tower in Chicago. (Photo: Brian Kersey, AP). Story Highlights. Zac Vawter lost his right leg in a motorcycle accident; He's helping to test a trailblazing prosthetic leg ...
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