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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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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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Asthma cases in Americans are about 75% higher today than they were in 1980.