In all honesty I never expected to go into this topic, but while writing my books about Groups 5 and 6, I began to understand that in order to understand their growth and evolution in the larger scheme of things, I needed to get a greater handle on this topic. I discovered it was horribly confusing. So after 4 months of slogging through 7 books on the topic, and endless hours moving things around in PowerPoint, I finally feel I have gotten a good grasp on the topic — in case you are interested.