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Been on Stack Overflow for a while now. I noticed that the post titles that are in the form of a question are usually much clearer than the ones that are not.
I think it's because it forces you to write a complete sentence instead of dropping the words out of your head.
Since Stack Overflow is about questions and answers, it may be possible to improve the question quality by checking if there is a question mark (?) in the title and refusing to accept the question if there is not.
What do you think?