Occasionally, some owe their survival not to struggle, but to simple luck. Take the startling case of Mitsutaka Uchikoshi. One ice-cold October day in 2006, Uchikoshi had been at a party on a mountian in western Japan. After wandering off into a field on his own, Uchikoshi tripped, hit his head, and was knocked un conscious. As Uchikoshi remember,"i was in a field and i felt very comfortable. That's my last memory." He remained unconscious in almost-freezing temperatures without food or water for more than three weeks.