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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.