Niagara Falls, NY (CNN) -- It's the ultimate in reality TV.
A week from today, Nik Wallenda will attempt to cross a tightrope over Niagara Falls.
And a national audience will be watching him on prime time.
So what motivates Wallenda to take such a risky walk on the wire?
As Jason Carroll tells us, he comes from a long line of daredevils.
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