The video lectures at the Khan Academy are terrible. Slow, not to the point, lecturer repeating himself because it was taking an age to actually write anything

The video lectures at the Khan Academy are terrible. Slow, not to the point, lecturer repeating himself because it was taking an age to actually write anything on the ridiculous blackboard they're using, and he's trying to fill dead air. No, they're great, and the very things Ducker criticizes are what makes them great. Most people that need help working problems find Kahn's "ridiculous blackboard" very helpful (myself included). His repetition is also useful if you're not an expert. And the pace? It's perfect if you're seeing the material for the first time. Not everyone is Andrew Ducker. What's obvious to him is not necessarily obvious to someone else.