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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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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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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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