Can a good teacher teach anything well?
I used to work for a headteacher who was fond of saying "We're teachers of children, not teachers of subjects." This was justification for having non-specialist teachers in certain shortage subjects. Like any axiom, there's some truth in this statement: teaching children is an art unto itself. There's definitely a case to be made for the fact that I might do a better job of teaching a maths lesson than a random maths graduate. My years of teaching experience mean that I'm well-versed in the essentials of persuading teenagers to sit down and do some work instead of snap-chatting each other. [...]