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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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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.