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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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Cyanide works by making the human body unable to use oxygen.
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The longest a person has survived after a heart transplant is 24 years.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.