Daredevil Nik Wallenda set for Chicago skyscraper crossings

The 35-year-old high-wire artist -- great-grandson of Karl Wallenda of the famous Flying Wallendas circus family -- plans to perform two nail-biting walks that will be televised Sunday to millions of viewers around the world. The Discovery Channel will use a 10-second delay for the broadcast, allowing producers to cut away if Wallenda falls.

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