Man with 'bionic' leg to climb Chicago skyscraperNBCNews.com (blog)Zac Vawter, who is fitted with an experimental "bionic" leg, is silhouetted on the Ledge at the Willis Tower in Chicago. Vawter, who is in training to climb to the top of the tower using the new prosthesis, recently took the elevator to the 103rd floor to see the view
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