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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
The human body produces and destroys 15 million blood cells every second.
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.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.