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, Dr. Levi Hargrove, lead researcher for the Rehabilitation Institute of Chicago's Center for Bionic Medicine, holds an experimental "bionic" prosthetic leg at the institute. Zac Vawter, a 31-year-old software engineer who lost his right leg in a motorcycle accident, will help test the trailblazing prosthetic leg, that's controlled by his thoughts, when he attempts to climb 103 flights of stairs to the top of Chicago's Willis Tower on Sunday, Nov. 4. (AP Photo/Brian Kersey)