Until recently, the brain remained the last terra incognita of the human body. Back in 1986, the eminent evolutionist John Maynard Smith identified the mystery of the brain as one of two unsolved problems in biology (the other being how an embryo develops into an adult organism). However, the latest neuroimaging methods provide a picture no less clear of our thoughts and feelings than x-rays of our skeleton. Rita Carter's book is an illustrated guide to the wrinkled, grayish substance the size of a coconut in each of our heads. The scientific consultant was the famous English neurobiologist and neuropsychologist Christopher D. Frith.