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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.

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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.

Prenatal development in humans. Prenatal development in humans.
Early instructions for administration of the small pox vaccine. Early instructions for administration of the small pox vaccine.
Umberto Boccioni, Development of a Bottle in Space. Umberto Boccioni, Development of a Bottle in Space.
In older adults, higher education is related to higher levels of ego development. In older adults, higher education is related to higher levels of ego development.
Indicators of Social Development Indicators of Social Development
Early growth of corn (Zea mays), a typical monocot. Early growth of corn (Zea mays), a typical monocot.
Video: Steps of glucose catabolism

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