Ever heard that plainclothes policeman aren't allowed to lie, and have to tell you that they're actually undercover cops if you ask them directly? Everyone has because everyone says it. Except, um, well... that's patently untrue.
What about how we only use 10 percent of our brains? Or how we should drink eight glasses of water every day? It seems like there are a lot of things that we take as givens that we really, really shouldn't.
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