The book gives information about Galen and how he learned, studied, and practiced medicine. The book also has some pictures of how he thought the human body worked, and other demonstrative pictures. I give this book 5 stars because it's great for learning about the first person who truly went over the top to study medicine. I recommend this book for kids over the age of 8, since it does include some things about killing animals and parts of the body which they may not know about. For example, the spleen. They say what the spleen is, but not what it does. I wouldn't consider this book an encyclopedia about the human body. It is more of a short storybook\text-book.