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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 eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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The horizontal fraction bar was introduced by the Arabs.