Agreed. I look back to my high school and college education and can't help but think that for a deeper understanding, exercises must be needed. It is too easy t

Agreed. I look back to my high school and college education and can't help but think that for a deeper understanding, exercises must be needed. It is too easy to think you have learned something but then fail at the easiest synthetic problem that requires you to use what you have learned to solve a problem.