I read all kinds of books (one of my friends jokes that I will read anything that holds still long enough), but sci fi/fantasy is my favorite. I also love books on anthropology and archaeology and other sciences.
A fantastic peek into common diversities. It gives a fascinating idea of how they are caused, how people think when they have these diversities, and ways that people, in some cases, compensate for the things they lack. A great read for someone interested in psychology and physiology.