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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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.
Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.