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There are 60,000 miles of blood vessels in every adult human.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.