Couldn't recommend this enough. I'm using it for Calculus and Linear Algebra. The "lectures" are all around 10 minutes explaining a single core concept, most t

Couldn't recommend this enough. I'm using it for Calculus and Linear Algebra. The "lectures" are all around 10 minutes explaining a single core concept, most times with examples. Everything is done with a tablet+drawing software and some person talking, but this simple setup couldn't be more effective. I have found that each of this 10 minutes lecture is equivalent to a full hour of my normal class, with an easier to understand (but not simpler) flow.