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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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.