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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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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.