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Nik Wallenda nears the completion of his 1400 foot walk across the Grand Canyon for Discovery Channel’s Skywire Live With Nik Wallenda, Grand Canyon, California, June 23, 2013 (Credit: AP Images/Tiffany Brown)

Nik Wallenda nears the completion of his 1400 foot walk across the Grand Canyon for Discovery Channel's Skywire Live With Nik Wallenda, Grand Canyon, California, June 23, 2013 (Credit: AP Images/Tiffany Brown)