Big, audacious dreams come with real risks. The dreamers are presented with a labyrinth of physical hazards, possible outcomes, hurdles, and dead ends. Often, we are told that success comes down to positive thinking, but maybe there’s a flip side to that coin. Few people have thought about risk more than Will Gadd, pioneer of modern mixed and ice climbing. And he’s got a lot to say. We also get some insight from Brette Harrington.