CameronJ,
That is an excellent learning experience. You had to form a question about previewing and superreading to get the distinction. You noticed that you missed something from the book itself and used the book to find the answer.
It's when you recognise that you don't know something and accept that you don't know it that you can make a path towards gaining the knowledge. It's when you can't accept that you don't know something yet that you build blocks into your path.
It's cool that I don't know why a bumble bee flies, I don't speak bumble bee so I can't ask him why. The world hasn't collapse cause I don't know. So I guess it can wait till I really have to know.
AlexK