JavaScript and the Authoring Tools

It's kind of like taking the traditional textbook, but making it something that is more native to the real world. If I'm learning about computer science, I should be able to run the code. And if you're going to use it for a class, let's say, save the answers to multiple choice questions or give the instructor a grading interface so they can go in and grade how the students did. So that's sort of the set of interactive, interactive services that support the book on the front end.