I ended up skimming through a lot of this book because it was just so jam-packed with information and history. I suppose some people might find this to be a good thing, especially if they are very interested in the subject matter, but it simply was not what I was looking for. Also, it's worth noting that the book itself is out-dated, having been written over 10 years ago. While the historical side of this is still valid, some of the scientific facts are not - much has changed in a decade. It was worth skimming at least.