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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

