Prepared for Anything

When I was in high school, I had a calculus teacher who would sometimes disparage some of his fixed-mindset colleagues. “In her lesson plans, there’s a week-long gap at the end of November,” he’d say. “It just says ‘No School — Kennedy was shot.'” Of course, he was exaggerating. This was 25 years after the Kennedy assassination. His point was that some teachers seem to …