Urgent question about pentatonic modes

Now...my last question...how do you know all of this stuff?

Seriously, this is amazing. I've learned more today, on this forum, than I have in quite a while. Noteboat, are you a teacher? Have you extensively studied theory or something? I Have a feeling that I'm going to be asking you a lot of questions in the future...if you don't mind.

Yes, and yes. I've been teaching guitar for a long time - this is my 28th year at it - and I've been studying theory for a long time, both in college and on my own after that.