AdvertisementFree-Climbing Yosemite's El Capitan Takes A Team — And TimeJanuary 06, 2015Serri GrasliefacebookEmailTommy Caldwell says he prefers to climb at night when the rock is cooler, his hands sweat less and the friction is better. He and Kevin Jorgeson have been trying for seven years to scale the whole Dawn Wall in one shot. (Courtesy of Corey Rich Productions)