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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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 modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The human body produces and destroys 15 million blood cells every second.