The best questions are always the ones that don't have a single clear answer. In my physics classes, I like to present students with problems that can promote a lively discussion—and to do that, they have to have multiple answers that could possibly make sense. (And they shouldn't involve lots of math, otherwise my students will just get hung up on the calculations.) Here is a version of one of these great questions; it's truly a classic. A human (person A below) has two baseballs.

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