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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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The longest a person has survived after a heart transplant is 24 years.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).