One thing all the good and memorable teachers I've had in my life have in common is that they could made me laugh. From a high school history teacher who threw erasers at sleeping students to a grad professor who could tell you you sound terrible in a way that made you look forward to hearing it. They weren't all Jerry Seinfeld but they had humor in their own way. Some witty, some dry, some sarcastic, some even a bit shocking, but all funny. I remember these teachers more vividly than the rest and I remember their lessons more clearly. Is there a correlation between laughter and learning?