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A Half-Century Of Battles For The Biggest Rock Walls

06:18
Tommy Caldwell trains on El Capitan's Dawn Wall in Yosemite National Park. Caldwell and fellow climber Kevin Jorgenson are currently attempting the first free climb of the wall. (Brett Lowell)
Tommy Caldwell trains on El Capitan's Dawn Wall in Yosemite National Park. Caldwell and fellow climber Kevin Jorgenson are currently attempting the first free climb of the wall. (Brett Lowell)

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