She didn't have to worry about facing the worst yawns or blank stares from students. (Other professors of course had no choice but to tolerate this.) History classes as you know, can turn out be really boring, even if you choose to study the subject out of interest. Lectures can go on and on until they make you fall asleep. In fact, most of my friends always considered history lectures as the perfect sleeping pill. Obviously it gets worse when professors are old and you can barely hear them. ...