Tommy Caldwell (Penguin Randomhouse)
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."