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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.