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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.
Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
Cyanide works by making the human body unable to use oxygen.