I never felt more like a clown than when I tried to teach undergraduates in a low level required (meaning big money for the university) course. But even with the best graduate students in the country, it is hard to not feel a clown as a teacher. There is a nice name in the title and certain afforded pleasures, but the indignities are many. I can only thank you as a form of encouragement for the work you've taken to instruct us all.