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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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The horizontal fraction bar was introduced by the Arabs.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.