This remarkable book is the product of a serendipitous encounter between an advocate for spirituality and a prominent physicist, and the respectfully contentious clash of worldviews that grew along with their friendship. Here, they battle over the cosmos, evolution, life, the human brain, and God, probing the fundamental questions that define the human experience.Sure to fascinate readers of science and spirituality, and anyone who has ever asked What does it mean that I am alive?