The rise of modern science has brought with it increasing acceptance among intellectual elites of a worldview that conflicts sharply both with everyday human experience and with beliefs widely shared among the world's great cultural traditions. Most contemporary scientists and philosophers believe that reality is at bottom purely physical, and that human beings are nothing more than extremely complicated biological machines. On such views our everyday experiences of conscious decision-making, free will, and the self are illusory by-products of the grinding of our neural machinery. It follows...