About 10 years ago, I started to design a learning system like this. It was before I had heard of Khan Academy. The idea is like that, but on steroids. Imagine

About 10 years ago, I started to design a learning system like this. It was before I had heard of Khan Academy. The idea is like that, but on steroids. Imagine a wiki where every lesson is available as a lecture and in writing (and where possible, an interactive lab, either in app or in real life). Every topic forms a graph that is explorable via links to get proper scaffolding. See or hear a word or topic you don't remember or understand? Click and follow the rabbit hole. The system would provide different styles of lecture and reading that align with a given student's preference. Educators could upload new content and students could rate that content as to help the best content raise to the top for other students to explore. To advance up the tree of a subject, a student would have to pass quizzes and the system would identify the holes in the student's understanding and provide content to fill the hole. Such a system could effectively flip teaching where teachers facilitate and help with questions while the software ensures the "best in class" content is provided and assessed. I still think about building that from time to time, but life and work don't leave me with the time to start building that. 10 years ago, I got a little ways into the engine for it for an algebra course and that was it.