CHARLES FOSTER is a Fellow of Green Templeton College at the University of Oxford. He is a qualified veterinarian, teaches medical law and ethics, and is a practicing barrister. Much of his life has been spent on expeditions: he has run a 150-mile race in the Sahara, skied to the North Pole, and suffered injuries in many desolate and beautiful landscapes. He has written on travel, evolutionary biology, natural history, anthropology, and philosophy. His books include Tracking the Ark of the Covenant and The Sacred Journey.