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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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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.