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Did you know?
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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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.
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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.