The average adult has about 21 square feet of skin.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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.