Is it really true that there are no dumb questions ? Some teachers certainly think so. They encourage students to ask any question, no matter how dumb it may seem. It's a good practice, in theory. It means that shy students or kids who aren't understanding the lesson have a chance to have their basic questions answered. After all, if you're thinking it, there's a good chance someone else is, too. This works great during math lessons, or it can lead to interesting discussions about books or work…