Hi L. Romanow: It was a college semester, not just one class meeting. I wasn't claiming to be any kind of expert, just sharing my experience in light of the talk about magnetic coils. Yes, our teacher used the same book by Dolores Krieger. I am glad you have found it so effective. It was simply one of the things I wondered about when I was trying to figure out what could have caused my Parkinsons. And lately when I read about the magnetic coils I was reminded of that long-ago class and wondered at the coincidence of an electric field. I was hoping somebody with your knowledge would respond. Thank you.