Not everything I try helps students learn physics. Sometimes I make mistakes, but I've learned from those mistakes. That's what this paper is about. I've taught at the same large, academically competitive suburban high school for enough years to notice trends in what students can do and how they can think. And no matter how much I lament changes, my job is to figure out how best to help my students learn. So when I noted a gradual deterioration in performance, I set out to do something about it.
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