I go to several sites here on SE, often to get answers to questions I have. This particular site is unique for me because as a native American English speaker, my role here is as a teacher. I'm almost never the student (although I have learned several things here).
When I fall into the role of "teacher" in life, I ask questions that I think will further the learner's understanding. I can easily see doing the same thing here.
Is it in any way inappropriate for me to ask questions to which I know the answer? Even if I don't plan to actually answer the question myself? For example, I'm thinking of the common phrase, "funnier than hell". I imagine that phrase could be puzzling to people who aren't used to it. I also imagine that there are people here that could explain it better than I could. Would it be somehow impolite to ask about what that phrase means, as if I didn't know?