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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Medication errors are three times higher among children and infants than with adults.
Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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.
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.