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Did you know?
If you could remove all of your skin, it would weigh up to 5 pounds.
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The horizontal fraction bar was introduced by the Arabs.
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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.
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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 1864, the first barbiturate (barbituric acid) was synthesized.