Growth in numbers. Decline in numbers. Much too controversial. I think, Mr McGuinness, you should go easy on the maths for a while. Also, for obvious reasons, no geography.
Practical chemistry seems a little touchy, too.
Hang on a minute. You're going to end up teaching the little critters nothing but poems. Glad you mentioned that. Literature is a bit of a minefield, isn't it. Then there's the actual poetry.