"Here are some web-based papers and articles you might read if you are interested in learning more about Dr. Seymour Papert's theory of constructionism."
A really interesting look at the Khan Academy, and more, and the bigger "Flipped Classroom" movement. The article contains a potted history of the Khan development as well as some rebuttals from Gary Stager and Sylvia Martinez. An interesting read for all wanting to know more about Khan.