A final subway anecdote for the evening

My roommate Katherine was on the train recently when she saw a couple of kids, looking suspiciously Stuyvesantian... with folded sheets of white paper, doing math homework. She told me this, and of course I understood immediately: They have Ms. Avigdor! Katherine and I were both in her calc class way back when, and we had to fold our homework just so. It was very old-school, very "I walked to school 30 miles barefoot in the snow," but it kept us on our (frostbitten) toes, which is what you need when taking second-term senior year calculus. Katherine asked the kids if they were in Avigdor's class, and they confirmed this. She reports that, as she was a stranger and of the opposite sex, the aforementioned Stuyvesantians did not look her in the eye. Sounds about right.