David Lynn Hall's love of philosophy began with a fifty-cent paperback. Then an adolescent facing an 18-hour bus trip across the great Southwest, desperate for anything to read, Hall bought Alfred North Whitehead's Adventures of Ideas at a rest stop in Pecos, Texas. He didn't have a clue who Whitehead was, but the book had a colorful, exotic cover, and nothing else on the revolving wire bookrack appealed to him. "I paid fifty cents, boarded the Trailways bus, nestled into my narrow seat and into the vastness of the desert spaces--and soon into the yet vaster spaces of humanity's great...