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Nik Wallenda is going to walk across the Grand Canyon on a tight rope with no nets or safety devices of any kind. It is going to be on Discovery Channel on Sunday at 8pm EDT. The section he will be crossing is 1500 feet above ground, tallen than the Empire State building.
I don't know if that embed will work. If not here is the link:
http://www.youtube.com/watch?v=gb3N0KpXlrE
That is just a taste of what the Grand Canyon will look like.