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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.