How I climbed a 3, 000 foot vertical cliff without ropes, Alex Honnold

Imagine being by yourself in the dead center of a 3, 000foot vertical cliff without a rope to catch you if you fall. For professional rock climber Alex Honnold, this dizzying scene marked the culmination of a decadelong dream. In a hairraising talk, he tells the story of how he summited Yosemite s El Capitan, completing one of the most dangerous free solo climbs ever.