Hans Rosling is amazing. There are many lessons in this talk about how well-being around the world has changed over the past forty years. But what struck me was the quality of the presentation.
My impression is that the number of professors who teach in lecture format is much, much larger than the number of really effective lecturers. I think that the best way to deal with this is to take the typical professor out of the lecture hall and instead substitute videos of the quality of Rosling's lecture.