Tom, I like your story. I will wait and see who cannot tolerate some distractions like that. When I see one, I will place them at the same side as the physics professor's side. :-) YK Chan p.s. we apply physics often enough in aerodynamics, hardly any distractions. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]