G'day Jim, You'd written: "I do a little number in my Micro classes called "Pareto Optimality at Auschwitz" ... " Way back, I changed degrees half a semester into an education/economics degree. Those who purported to teach how to teach couldn't teach, and those who purported to explain human behaviour weren't talking about anybody I knew - well, not then, anyway. Maybe I wasn't as lucky with my teachers as your students so obviously are. Maybe too many of us weren't. All the best, Rob.