Prof. Donald Pfaff brings us right up to date with the neurobiological differences between males and females - and tries to unravel the origins of these differences. This is different to scholarly articles in that he tries to personalise the researchers using familiar names and locations - which gives this book an interesting edge. The text is great but the diagrams are somewhat clunky for even a semi-technical book. They seem to have been done by an artist with not much idea of biology - or perhaps they were trying to make the diagrams less serious. They certainly achieved this. The one on page 175 showing pediatric surgery to correct a urinary opening defect is not up to the standard of accuracy in the text. It is distinctly odd. The book is well thought out and is logically organised. He skims over the cognitive differencs between man and women as it is not his area - and he makes a few generalisations that could be more nuanced. Contact with a cognitive specialist in sex differences would be a benefit. In summary - a great book that makes you take notes to keep up with all the technical twists and turns but leaves you feeling that you are right up to date with the lastest research from an internationally respected researcher.