Man with bionic leg to climb Chicago skyscraper

Associated Press
Man with bionic leg to climb Chicago skyscraper

In this Oct. 25, 2012 photo, Zac Vawter, fitted with an experimental "bionic" leg, is silhouetted on the Ledge at the Willis Tower in Chicago. Vawter is training for the world's tallest stair-climbing event where he'll attempt to climb 103 flights to the top of theWillis Tower using the new prosthesis. (AP Photo/Brian Kersey)

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