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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.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
The average adult has about 21 square feet of skin.
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.