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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.
The horizontal fraction bar was introduced by the Arabs.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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.