Some people climb mountains, race cars, surf, pilot airplanes, luge, or share their lives with animals, and each of these journeys poses risks, although in truth people are far likelier to die in traffic accidents or childbirth than in any of these more dramatic undertakings. Sitting at home on a couch may indeed be a safer choice, but living a rich and full life and owning our own choices and their consequences are worth a little risk.