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