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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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.
Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
Vaccines prevent between 2.5 and 4 million deaths every year.