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Zac Vawter stands on "The Ledge" of the Willis Tower in Chicago after walking up the stairs of the building Sunday, 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 was wearing a prosthetic leg controlled by his mind while participating in "SkyRise Chicago." (AP Photo/Chicago Sun-Times, Brian Jackson)

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Man climbs Chicago skyscraper with bionic leg

The metal on Zac Vawter bionic leg gleamed as he climbed 103 floors of Chicago's iconic Willis Tower, becoming the first person ever to complete the task wearing a mind-controlled prosthetic limb.

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