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Did you know?
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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.
Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.