Zac Vawter, a 31-year-old amputee, emerges after walking up the stairs of the Willis Tower in Chicago on 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. (Brian Jackson / Chicago Sun-Times, Associated Press)
Read the article: Man with bionic leg completes 103-floor climb in Chicago skyscraper
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