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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 average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

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Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

European Rabbit in Shropshire, England, infected with myxomatosis, a disease caused by the Myxoma vi European Rabbit in Shropshire, England, infected with myxomatosis, a disease caused by the Myxoma vi
Inflammation. Inflammation is characterized by the presence of swelling, redness, heat, and pain. Sw Inflammation. Inflammation is characterized by the presence of swelling, redness, heat, and pain. Sw
Optical microscopes are commonly configured for bright-field (transmitted), phas Optical microscopes are commonly configured for bright-field (transmitted), phas
The Fukushima disaster in Japan caused many governments to rethink their commitment to nuclear power The Fukushima disaster in Japan caused many governments to rethink their commitment to nuclear power
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Video: Calvin cycle (The light-independent reactions )

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