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.
I find "How do I proceed to find out more about X" to give best results. Note: it's important to phrase it so that they understand you are asking for an efficient algorithm to find out about X, not for them to tell you about X!
It works even if you're completely green and talking to a prodigy in the field (which I find to be particularly hard). Otherwise you'll get "RTFM"/"JFGI" at best or they will avoid you entirely at worst.