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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.