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Inspiration. >> when you're walking at a height greater than the empire state building, it can play tricks on your mind, so it's important that i'm always in charge of those thoughts. one of the big challenges leading up to a walk like this is all the media that wants to talk about the doom and gloom. this is real, this is untethered. this is not like niagara falls where my network said you have to wear a tether. this is the discovery channel and they believe in me, so this is life or death, this crossing, and it's important that i'm mentally in control of everything. >> want to see it? "skywi...

Tonight, daredevil nik wallenda will try to become the first man to tight rope walk -- try to say that three times -- tight rope walk across the grand canyon without a safety harness. last summer he crossed the niagara fathers wearing a tether. wallenda is the great grandson of carl wallenda, a famous acrobat who plunged to his death. four other family members have died while performing. wallenda says they're his inspiration. >> when you're walking at a height greater than the empire state building, it can play tricks on your mind, so it's important that i'm always in control of those thoughts...