Susan Butcher won the 1,157-mile Anchorage-to-Nome Iditarod sled-dog race four times, helping smash the notion that men have more endurance and challenge nature more ably. She and her husband, David Monson, live in Eureka, Alaska, with their two-year-old daughter, Tekla, and 70 dogs. Butcher, 42, entered her first Iditarod in 1978, finished in the top 10 the next year and has been in the top five 12 times since. "I don't think anyone who is a true pioneer thinks of themselves as one," says Butcher. "They're just doing something they have a passion for."