In some sense, I should be pleased that my demonstration "worked." Now I can go in and say, "Hey, bozos, try rubbing a few brain cells together when you do the homework." (Actually, I never talk to my students like that. I'll be polite and positive, but also try to convey the idea that homework is there for a reason.)
In another sense, I'm still disappointed. Somehow, I blame myself. Why couldn't I have covered this topic better, or spent more time on that? Of course, the truth (and I really do know it, deep down) is that it barely matters what I do in class, if they aren't going to do the work outside of class.
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