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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.