Chongo and Maia's kindergarten teacher once told me this story.
She was at a dinner with her business exec ex-husband. Someone asked her what she did.
"I'm a teacher."
"Oh, what grade do you teach?"
"Don't worry, I'm sure you'll be able to move up."
I'm not sure which is harder to teach -- middle school or kindergarten. All I know is that both of those grade groups take a teacher who is particular to them. Otherwise it would be easy to give up the teaching thing. Most teachers of other grades say they'll teach anything but kindergarten or middle school. So I consider the teachers who prefer middle schoolers or kindergarteners as teachers who've chosen a specialty. Otherwise known as experts in their field.