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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.