Have you ever heard of "weed-out courses" ? Admittedly, they are about teaching things. For example, teaching Laplace transforms to mechanical engineers. It ce

Have you ever heard of "weed-out courses" ? Admittedly, they are about teaching things. For example, teaching Laplace transforms to mechanical engineers. It certainly isn't true to say the "courses are not about teaching anything". But if 20% of the class should decide to change majors to business? Well, there's been some filtering out of students too.