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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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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.

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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By definition, when a medication is administered intravenously, its bioavailability is 100%.

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