At least they introduce people to the very alien concept of experimentation. You wouldn't believe the sorts of stuff people will come out with (hmm... actually, you probably would) about day-to-day phenomena that is so totally bogus, and the thought to test the idea, which is well within their means to do, never occurred to them. I've actually found that some people are genuinely offended when I suggest they try an experiment. Usually people who have invested a lot of money in their particular brand of snake oil.
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