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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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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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The human body produces and destroys 15 million blood cells every second.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.