KHAN Academy App offers thousand of videos with the goal of providing complete mastery, filling in any gaps in knowledge. There are categories of instructional videos for Math, Science, Economics, Humanities. Students can pause and repeat as often as needed. Plus the absence of a face is actually helpful to autistic students, since it avoids sensory overload that can interfere with their learning. Khan videos can be used as a supplemental resource or for flipping the classroom. Has anyone used them in their classes?