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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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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.