Every human being has an armory of instincts that helps keep him or her alive. This program analyzes how the senses, innate physical reactions, and the ability to manage risk boost the chances of survival. An infant’s cry, its primary defense during life’s most helpless time; a craving for high-calorie foods that harks back to eras of food scarcity; an inborn disgust mechanism that prompts people to avoid eating things that taste bad or look sickening; the fight-or-flight reaction, as it affects thrill-seekers and crime victims; and a willingness to gamble—whether with money or life itself—are studied. A BBCW Production. (50 minutes)