We all know the situation well, which is why "Anyone, anyone?" resonates so well as comedy. The professor asks the class for questions, no hands go up, the lecture proceeds. The young professor has ambitions to teach a highly interactive course, yet no one speaks up, and frustration ensues. What went wrong? Why won't anyone raise a hand? To my mind the answer is quite simple, but it has taken me more than 15 years to figure it out. The problem is that asking a question in a lecture hall or even a class of 10 students, represents a high-stakes proposition for the student. Worse yet, the proposition is low-reward. Thus, a student not asking questions in class is a student acting rationally to the odds presented them. I'll flip this coin. If you get it right, I pay you a buck. If you get it wrong, you owe me $100. Wait, why are you walking away?! Smart money walks away. So what is the high-risk proposition? As a professor I'm requesting that a student to...