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. “I reached the summit after three hours and 56 minutes of glorious climbing,” Honnold said. “It was the climb that I wanted, and it felt like mastery.” In his hair-raising TED Talk, he tells the story of how he summited Yosemite’s El Capitan, completing one of the most dangerous free solo climbs ever. • Watch and react on Genuin

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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. “I reached the summit after three hours and 56 minutes of glorious climbing,” Honnold said. “It was the climb that I wanted, and it felt like mastery.” In his hair-raising TED Talk, he tells the story of how he summited Yosemite’s El Capitan, completing one of the most dangerous free solo climbs ever.