I had a Calc professor who also wrote the book we used. It was an early draft (not actually published, just printed out and bound) and we had to buy it. Unfortu

I had a Calc professor who also wrote the book we used. It was an early draft (not actually published, just printed out and bound) and we had to buy it. Unfortunately, his teaching method was impenetrable to most students and so was his book. So most everyone failed the course and got saved by the curve.