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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.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
If you could remove all of your skin, it would weigh up to 5 pounds.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.