Man with 'bionic' leg set to climb 103 flights of stairs

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Bionic Stair Climber
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Bionic Stair Climber
In this Oct. 25, 2012 photo, Zac Vawter, fitted with an experimental "bionic" leg, looks down from 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 the Willis Tower using the new prosthesis. (AP Photo/Brian Kersey)