This is an attempt to explain the meaning of physics by talking not just about the facts of the physical world, but about the way physicists think. Examining the tools and thought behind scientific method, Lawrence Krauss discusses the ideas and tricks of individuals from Plato to Marshall McLuhan and Stephen Hawking. Among the topics explored are how to handle the art of numbers, how physicists define truth, and how and when to plagiarize creatively. Krauss also wrote Cosmic Strings and The Fifth Essence.