Every so often, at around 7:00 p.m., I’ll get a call from someone I know. “I don’t understand my kid’s math homework,” they’ll say. These folks aren’t dumb or bad at math. But almost always, they’ve hit a concept that they
Every so often, at around 7:00 p.m., I’ll get a call from someone I know. “I don’t understand my kid’s math homework,” they’ll say. These folks aren’t dumb or bad at math. But almost always, they’ve hit a concept that they