In 1982, Julie Moss ran the Ironman triathlon for her college senior research project. Her idea was quirky, even crazy; only a handful of hardcore, highly trained enthusiasts competed in the little-known, 140.6-mile combination of swimming, cycling, and running. Julie brought no experience or appreciable training beyond running two marathons. She did bring a latent willpower that, the world soon found out, wouldn't be denied. What happened next changed...