"Zac Vawter, left, a 31-year-old amputee, walks up the stairs of the Willis Tower in Chicago, 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 when he participated in ""SkyRise Chicago."" (AP Photo/Chicago Sun-Times, Brian Jackson) CHICAGO LOCALS OUT, MAGS OUT"
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