In a handout photo, Tommy Caldwell, left, and Kevin Jorgeson climb the Dawn Wall on El Capitan in Yosemite National Park, Jan. 1, 2015. The two climbers are attempting to climb more than half a mile up a section known as Dawn Wall without the benefit of ropes, a feat they have sought for several years with single-minded obsession.
In a handout photo, Tommy Caldwell, left, and Kevin Jorgeson climb the Dawn Wall on El Capitan in Yosemite National Park, Jan. 1, 2015. The two climbers are attempting to climb more than half a mile up a section known as Dawn Wall without the benefit of ropes, a feat they have sought for several years with single-minded obsession. BRETT LOWELL NYT
In a handout photo, Tommy Caldwell, left, and Kevin Jorgeson climb the Dawn Wall on El Capitan in Yosemite National Park, Jan. 1, 2015. The two climbers are attempting to climb more than half a mile up a section known as Dawn Wall without the benefit of ropes, a feat they have sought for several years with single-minded obsession. BRETT LOWELL NYT

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