Imagine being by yourself in the dead center of a 3,000-foot 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 decade-long dream. In a hair-raising talk, he tells the story of how he summited Yosemite's El Capitan, completing one of the most dang...

In 2017, Alex Honnold did what even the world's best rock climbers thought was impossible. He climbed to the top of El Capitan– a granite rock mountain more than 3,000 feet high– without a rope, harness, or net. His audacious feat was the subject of the Oscar-winning documentary "Free Solo," and it left Adam with some burning questions about wha...