THANK YOU EVER SO MUCH for that wonderfully detailed info! I haven't read it in its entirety, but I DID print it out. I've started a 3-ring health notebook incorporating various informational posts and text from this site - and what you just contributed is highly elucidating and educational. I'll be referring to it often and rereading it frequently. Not to mention, it will probably set me off on some of my own learning journeys.
Thanks again for taking the time to write and post that for all of us!