I'm going to paraphrase part of someone else's review because I don't know quite know how to explain this book.

"It was a very interesting book about humans in the context of other species - the fact that we need other species in order for us to make sense and learn about ourselves. It is a series of ideas and theories strung together with stories. Here are some examples: intestinal parasites helping to cure IBS, asthma, and Crohnes; the use of our appendix; why our vision developed the way it did; our farming vs. that of ants; our subconscious responses to seeing a sick person. The list goes on. The journal sources are sited."

The information given is a bit staggering, and I like that the author summarizes a lot of science (and had the scientists edit those portions of his book). The content is fodder for many discussions on nature, evolution, health, the human body, too much to mention.

The part about intestinal worms alone is worth the read and that is in the first section of the book.

The only hard thing about this book is that it jumps around a bit and until the final page, I didn't quite understand the connection between all the studies.