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, Sunday, Nov. 4, 2012. Kneeling in front is Levi Hargrove, Director of Neural Engineering for Prosthetics and Orthotics Laboratory at the Rehabilitation Institute of Chicago. Vawter became the first person to stair climb to the 103rd floor of Willis Tower wearing a mind-controlled prosthetic limb Sunday. (AP Photo/Teresa Crawford)

Associated Press
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, Sunday, Nov. 4, 2012. Kneeling in front is Levi Hargrove, Director of Neural Engineering for Prosthetics and Orthotics Laboratory at the Rehabilitation Institute of Chicago. Vawter became the first person to stair climb to the 103rd floor of Willis Tower wearing a mind-controlled prosthetic limb Sunday. (AP Photo/Teresa Crawford)
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, Sunday, Nov. 4, 2012. Kneeling in front is Levi Hargrove, Director of Neural Engineering for Prosthetics and Orthotics Laboratory at the Rehabilitation Institute of Chicago. Vawter became the first person to stair climb to the 103rd floor of Willis Tower wearing a mind-controlled prosthetic limb Sunday. (AP Photo/Teresa Crawford)
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