Cracks appear on glass ledge at Chicago's Willis Tower

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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. (AP Photo/Chicago Sun-Times, Brian Jackson) CHICAGO LOCALS OUT, MAGS OUT