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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.
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.