Brian Jackson/Chicago Sun-Times/AP Photo
  • Zac Vawter Climbs Willis Tower

    Zac Vawter stands on The Ledge of the Willis Tower in Chicago after walking up the stairs of the building, Nov. 4, 2012, to become the first person to climb the 103 floors of one of the world's tallest skyscrapers with a bionic leg. Vawter became the first person to stair climb wearing a prosthetic leg controlled by his mind.
    Brian Jackson/Chicago Sun-Times/AP Photo
  • Zac Vawter Climbs Willis Tower

    Zac Vawter walks up the stairs of the Willis Tower in Chicago, Nov. 4, 2012, to become the first person to climb the 103 floors of one of the world's tallest skyscrapers with a bionic leg.
    Brian Jackson/Chicago Sun-Times/AP Photo
  • Zac Vawter Climbs Willis Tower

    Zac Vawter, a 31-year-old amputee, emerges after walking up the stairs of the Willis Tower in Chicago, Nov. 4, 2012, to become the first person to climb the 103 floors of one of the world's tallest skyscrapers with a bionic leg.
    Brian Jackson/Chicago Sun-Times/AP Photo
  • Zac Vawter Climbs Willis Tower

    Zac Vawter stands on his bionic leg after he arriving on the 103rd floor of Willis Tower, becoming the first person ever to complete the task wearing the mind-controlled prosthetic limb, Nov. 4, 2012 in Chicago.
    Teresa Crawford/AP Photo
  • Zac Vawter Climbs Willis Tower

    Zac Vawter, wearing his bionic leg, stands in the center of a group of researchers from the Rehabilitation Institute of Chicago at Willis Tower in Chicago, Nov. 4, 2012. Kneeling in front is Levi Hargrove, Director of Neural Engineering for Prosthetics and Orthotics Laboratory at the Rehabilitation Institute of Chicago.
    Teresa Crawford/AP Photo
  • Zac Vawter Climbs Willis Tower

    Physical therapist assistant Suzanne Finucane, right, helps Zac Vawter as he practices walking with an experimental "bionic" leg at the Rehabilitation Institute of Chicago, Oct. 25, 2012 in Chicago.
    Brian Kersey/AP Photo
  • Zac Vawter Climbs Willis Tower

    Zac Vawter practices walking with an experimental "bionic" leg at the Rehabilitation Institute of Chicago, Oct. 25, 2012 in Chicago.
    Brian Kersey/AP Photo
  • Zac Vawter Climbs Willis Tower

    Zac Vawter kicks a soccer ball with an experimental "bionic" leg as biomedical student Aaron Young makes adjustments to the leg at the Rehabilitation Institute of Chicago, Oct. 25, 2012 in Chicago.
    Brian Kersey/AP Photo
  • Zac Vawter Climbs Willis Tower

    Physical therapist assistant Suzanne Finucane, right, helps Zac Vawter as he practices walking with an experimental "bionic" leg at the Rehabilitation Institute of Chicago, Oct. 25, 2012.
    Brian Kersey/AP Photo
  • Zac Vawter Climbs Willis Tower

    Zac Vawter practices walking with an experimental "bionic" leg at the Rehabilitation Institute of Chicago, Oct. 25, 2012 in Chicago.
    Brian Kersey/AP Photo
  • Zac Vawter Climbs Willis Tower

    Biomedical Engineer Annie Simon, left, and Research Prosthetist Elizabeth Halsne, right, fit an experimental "bionic" prosthetic leg on Zac Vawter at the Rehabilitation Institute of Chicago, Oct. 25, 2012 in Chicago.
    Brian Kersey/AP Photo
  • Zac Vawter Climbs Willis Tower

    Zac Vawter looks out onto the Ledge at the Willis Tower, Oct. 25, 2012 in Chicago.
    Brian Kersey/AP Photo
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