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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
Medication errors are more common among seriously ill patients than with those with minor conditions.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

