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Let me come right out and say it. They cheat. You cheat. And yes, I also cheat from time to time. As a college professor, I try to mix things up a bit in order to keep my students interested in the material. To this end, I occasionally invite interesting guest speakers to class, which is also a nice way to reduce the time I spend on preparation. Basically, it’s a win-win-win situation for the guest speaker, the class, and, of course, me.