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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.