Man Climbs 103 Floors Using Thought-Controlled Bionic Leg [VIDEO]

Fitted with a "thought-controlled bionic leg," amputee Zac Vawter climbed 103 floors of Chicago's Willis Tower -- accomplishing a task that would intimidate even seasoned athletes.

But the 31-year-old, whose right leg is amputated, had help from a neural-controlled prosthetic leg. The device, which has a powered knee and ankle, can anticipate Vawkter's actions. For example, when he pushes on the leg to stand up, it "reads his intent," and pushes back, propelling him up, according to the Rehabilitation Institute of Chicago.

"One of the biggest difference(s) for me is being able to take stairs step-over-step like everyone else," Vawter said in a s…
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