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Niagara Falls high-wire crossing latest in history of stuntmen's derring-do | Extreme sports | The Guardian
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Niagara Falls tightrope walk 2012: Walker Nik Wallenda becomes first person to cross | Daily Mail Online
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Niagara Falls tightrope walk 2012: Walker Nik Wallenda becomes first person to cross | Daily Mail Online
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Niagara Falls daredevil plans to cross Grand Canyon without a harness | The Independent | The Independent
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Niagara Falls tightrope walk 2012: Walker Nik Wallenda becomes first person to cross | Daily Mail Online
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