In 1972, when the world around him was making little sense, David Sklar left in his senior year of college to volunteer at a community clinic in rural Mexico. With absolutely no medical experience beyond being accepted to medical school at Stanford, Sklar literally learned medicine by practicing it. With duties that ranged from suturing wounds and delivering babies to digging latrines to pulling teeth, his time at the clinic took him into the heart of a medical world that the sterilized walls of the twentieth century would never have shown him. The experience challenged his idealism and,...