Grimace & act like it hasn't affected you:
I'm teaching (a short contract position) at a small school that works with "the unmanage-ables" of the school system. It is challenging!
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Today one child said something particularly unpleasant to me. Then a second later he asked: "Do teachers' have feelings, Olga?" They may not have many social skills, but they are EXPERTS in pushing buttons!
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The teachers who work there permanently are saints!