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, physical therapist assistant Suzanne Finucane, right, helps Zac Vawter as he practices walking with an experimental "bionic" leg at the Rehabilitation Institute of Chicago. After losing his right leg in a motorcycle accident, the 31-year-old software engineer signed up to become a research subject, helping test a trailblazing prosthetic leg that's controlled by his thoughts. He will put this leg to the ultimate test Sunday, Nov. 4 when he attempts to climb 103 flights of stairs to the top of Chicago's Willis Tower, one of the world’s tallest skyscrapers. (AP Photo/Brian Kersey)