Well, I'm not sure why my previous review wasn't helpful unless people are responding to my negative rating alone. So, here's a shorter, revamped review. The author doesn't check his facts. As I was reading the book, I was embarassed for him. It often seems his main source for information is the Discovery Channel and not enough real research that one should expect from someone of his status. I've done further research on the matter and found that the author in the book isn't entirely honest about "his" own accomplishments as well. The book does have some good information, but he spends too much of the print puffing up his own ego, and not enough supporting his arguements.My recommendation is AVOID. Wait for another book on the topic.