I'm happy to keep duplicate questions in the system, even if it means I repeat myself when I answer them. But question askers need to show that they've done a

I'm happy to keep duplicate questions in the system, even if it means I repeat myself when I answer them. But question askers need to show that they've done a little research first: if I can type a few words from the OP's question into Google and get a reasonable response, then the question's a candidate for closing. (One phenomenon I've seen is "I don't believe it unless I see it on Stack Overflow". Somehow a Stack Overflow answer is better than the same information posted elsewhere...)