It seems like Khan Academy initially covered whatever Sal Khan found interesting, so there is Calculus, Linear Algebra and Differential Equations. Now that it's

It seems like Khan Academy initially covered whatever Sal Khan found interesting, so there is Calculus, Linear Algebra and Differential Equations. Now that it's become more focused, a side effect is that there's a bigger concentration on grade school-level stuff. It is a pity though. It would have been great to see KA covering Theoretical CS as well as Discrete Math.