Why Zebras Don't Get Ulcers Audio CD – Unabridged, 31 Dec. 2012

This is a very detailed book about stress, the brain and immunity, written in a lively manner. If you don't have a background in the biological sciences, it could be slow going. It is fascinating material and worth the effort of re-reading passages sometimes, or for the audio version, listening over again. The author makes sense of why some people get sick from stress, what chronic stress is, how the immune system works and much more. It is an entire semester packed into one book and much more enjoyable and affordable.

Anything out of Robert Sapolsky is good, this is also good.