All scientific evidence supports the astonishing hypothesis that minds are brains and brains are biological machines. But, then, what sort of neural architecture accounts for the human ability to think? The answer logically follows from another astonishing hypothesis: There is no source of creativity anywhere in the universe other than the process of evolution. Such is the simple premise on which this book's description of all intelligence is based. Human thinking is thus reduced to a mechanistic process of neural firing patterns evolving. In this unique yet simple model of mind, memes are the currency of creative thought. All sorts of intelligence, from the creation of the universe all the way down to human thoughts, are explained as evolving patterns.