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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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Everyone has one nostril that is larger than the other.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.