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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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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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Thyroid conditions may make getting pregnant impossible.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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The longest a person has survived after a heart transplant is 24 years.