Keep in mind how this all got started historically [0]. Khan was teaching math to his cousin and did this with what he had available. It is a very personal styl

Keep in mind how this all got started historically [0]. Khan was teaching math to his cousin and did this with what he had available. It is a very personal style and, yes, includes mistakes from time to time that necessitates him backtracking and correcting them. I haven't watched a lot of videos, but I've yet to see a mistake that he doesn't eventually realize and backtrack to correct it; sometimes within seconds, sometimes half a minute later. Polishing it too much such that it's scripted with a professional voice actor would, to me, make the videos less approachable and would lose the charm. People pay thousands in tuition for university courses taught by professors who are also not perfect and who have no professional voice acting training either. I'm not seeing this lack of polish as a negative here. Actually, a lot of times I find professionally voiced audio to be annoying as hell because nobody in real life actually talks the way some of those cheesy voice actors do. [0] http://en.wikipedia.org/wiki/Khan_Academy#History http://en.wikipedia.org/wiki/Khan_Academy#History