While I do not disagree that some students might cause, by asking / or answering questions, the flow of the class to go backwards to a degree, I must say that when I pay my hard earned money to take a class, I darn well want my questions answered. I am in that class for a reason; to learn. Consequently I fully expect questions I may have to be answered (as applies to course material) and I personally don't care if the instructor likes it or not. As one may imagine, I afford that same philosophy to my students. Inspired Class room management techniques do not require an instructor to ignore a student that may have his hand in the air a lot, or a long time. Just sayin' .....