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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 first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.
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There are 20 feet of blood vessels in each square inch of human skin.