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The familiar sounds of your heart are made by the heart's valves as they open and close.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Your heart beats over 36 million times a year.
Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.
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.