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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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There are 60,000 miles of blood vessels in every adult human.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.