I had this math teacher once, His name was Tampkins. He'd come into class and chat about all sorts of things as well as math. He was very quiet spoken. He never gave homework; he said that it wasn't teaching. Even when teaching calculus he would go back as far as necessary, I've even seen him put 2 + 2 = 4 on the board. He had this gift that somehow, miraculously, at the end of the class you knew about math. There was a saying in the school - "If you don't pass with Tampkins, you'll never pass"

Bert.