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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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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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There are 60,000 miles of blood vessels in every adult human.
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The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.