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Did you know?
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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The human body produces and destroys 15 million blood cells every second.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.