Flipped Classroom

After Khan Academy came to be, some teachers started using "flipped classrooms." A flipped classroom is one in which the teacher assigns videos for homework (in many cases, Khan lectures) then students work on problems (traditionally homework) in class, where the teacher is available to help. This is supposed to personalize teaching. I love the idea! I don't think it would work for every subject, but I think especially for the maths and sciences, this could work at most levels.