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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
More than 4.4billion prescriptions were dispensed within the United States in 2016.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
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.