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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

The Sun in false-color ultraviolet image The Sun in false-color ultraviolet image
(A) Major leukocytes. (B) Enhanced color photograph from a scanning electron microscope of a ... (A) Major leukocytes. (B) Enhanced color photograph from a scanning electron microscope of a ...
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Additive Color Mixing Additive Color Mixing
Incomplete dominance in snapdragon flower color. Red-flowered snapdragons crossed with white-flowere Incomplete dominance in snapdragon flower color. Red-flowered snapdragons crossed with white-flowere
Blue Eye Color Blue Eye Color
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