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Everyone has heard them before. They usually come from a grandmother or kids on the playground. They're medical myths. You may be a firm believer or may think most medical myths are just tools mothers use to frighten their children. The myths people have grown up with are either based in fact -- or not at all.

CNN.com consulted doctors and researchers to uncover the real deal about these myths. E-mail us the myths you're curious about, and we'll find out the truth about those, too. Check back each week to see which myths are added.