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Oh, and in case you are wondering what I mean by "pedagogical," I have a professor (economics) who uses it for his classes. It's simply the WORST way to teach anyone anything, or to convey ANY message. You get lost in the show, and your brain goes on autopilot because the students do not contribute to the learning experience (as much). You just copy the words and diagrams verbatim, and do the learning out of the classroom.