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The average office desk has 400 times more bacteria on it than a toilet.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The human body produces and destroys 15 million blood cells every second.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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.