Not only is it a GREAT article; it is one of the best explanations of AD I have ever read. I am in the process of re-reading it carefully, as I want to take parts of it and put it into a Blog, so everyone can read the highlights.
It explained just about everything for me. The mystery is gone now. I am grateful for having read it. A must read for anyone who is new to all this & confused about what is going on.