 I first found Will Crinan, M.D., who, while not an anthropologist, was one of the few medical doctors in the world to have spent years of his career as the physician to an indigenous hunting society, one of the last of the Native American tribes in Canada. Each year, every year, he followed them with his small plane as they made their annual 1,000-mile trek with the caribou they hunted. He told me that when he first arrived, he found that the previous doctor had diagnosed 100% of their children with ADD and put the entire school on Ritalin.