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There are 60,000 miles of blood vessels in every adult human.
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The horizontal fraction bar was introduced by the Arabs.
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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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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.