Khan Academy is interesting but imo it's not complete. Technology enables us to make learning an interactive experience -- either interacting with another perso

Khan Academy is interesting but imo it's not complete. Technology enables us to make learning an interactive experience -- either interacting with another person or with a REPL interface (like Codeacademy). Just posting videos online in one place is kind of like the obvious step that took a surprisingly long time to get to. It's definitely a step forward, but I can't imagine people are learning enough about, for example, Biology to be able to do something significant with what they've learned. Computer science is a little different, because people have been learning CS online since well before Khan Academy.