Hi Ben, thank you for doing this. A while ago Sal mentioned the possibility of doing a grammar video series and creating modules to help students practice and master the concepts. Is this still being worked on or has it taken a back seat? If a back seat, to what? I feel that a lot of the educational websites (KA, Udacity, Coursera, etc) focus on math/programming/science and the humanities have been *somewhat* neglected. Thanks for teaching me linear algebra!