The Audacity of the World’s Most Daring Climber

Tommy Caldwell and Alex Honnold

Tommy Caldwell (Penguin Randomhouse)

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Alex Honnold stunned the world by climbing the 3,000-foot El Capitan without a rope. So why take such a chance? Honnold disputes the notion that it’s “incredibly risky,” but his buddy — and fellow top climber — Tommy Caldwell says it’s like watching his friend play Russian roulette.

And here's a trailer for the National Geographic film about Honnold's climb, "Free Solo."