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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.