The Grand Canyon dare

Updated: Jun 24, 2013 16:06 IST

Aerialist Nik Wallenda walks a 2-inch-thick steel cable taking him a quarter mile over the Little Colorado River Gorge, Arizona. (AP/Discovery Channel)
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Aerialist Nik Wallenda walks a 2-inch-thick steel cable taking him a quarter mile over the Little Colorado River Gorge, Arizona. (AP/Discovery Channel)

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