After all, if you don't at least occasionally have a stupid question to ask, you're probably poorly calibrated on how many questions you should be asking.
Or you know, you might be using Google for asking the questions that would be considered stupid. (In fact for me the definition of a stupid question is a question that could be answered by googling for a few minutes)
Here's a possible norm:
If you'd like to ask an elementary-level question, first look up just one word — any word associated with the topic, using your favorite search engine, encyclopedia, or other reference. Then ask your question with some reference to the results you got.
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.