These are all great questions but I'd like to focus initially on a classroom teacher audience/discussion, so I think some are more relevant and appropriate than others for that group; my personal favorites would be 4, 8, 3, 7(not the second part of it), and 5, in that order. I don't think most teachers would have a good sense of 2 (opinions, perhaps, but probably not much evidence), and 1 is an interesting question but a bit nebulous (although that quality might also mean it would spark a provocative discussion).

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