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Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

J. P. Morgan, the financial genius, staved off ruinous competition among steel firms by combining mo J. P. Morgan, the financial genius, staved off ruinous competition among steel firms by combining mo
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Video: Mycobacterium tuberculosis: Drug Resistance and Natural Selection

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