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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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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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The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

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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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