In other news:

Having left behind tutorial activity on financial topics, I've been happy to return to "other" topics in math. It was always a pleasure to teach calculus to first-year students ... they even laughed at my jokes. There's this calculus forum where high school teachers discuss problems and solutions (among other things). For some time now I've been writing stuff on topics that seem to crop up: Topics. It carries me back to the good ol' days when I taught at the University of Waterloo ... except, with tutorials, nobuddy laughs at my jokes. Anyway, here's a sample of the kind of problem that arises: Then you guess what the graph of the second derivative looks like. To play this game click here.