David David's unfortunately seems to have come to this forum in the interest of behaving as a troll. While I welcome his participation in conversation it is not worth dignifying his trolling with a response, some advice that I myself clearly need to take to heart. Thank you for stepping up to defend the initial poster, who it seems to me as you said was simply posing an interesting and legitimate question.That's unfair. He had a genuine question, and it was answered. How else can he understand the concept if not by asking?