Educational books and films?

There was an interesting article in the paper recently based on China and the boom in tutorial services. Many tutors are becoming very wealthy, because they are so highly regarded. One of the items they use, is power point, films, video etc, working on the theory that the kids have been in school all day, are tired and bored, and it's essential to catch their interest in order to teach them. If it works in the exreme of a tutorial system, it would surely work even beter in the school system, before the kids got bored and tired. You might try googling the topic.