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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.