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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.