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There are 20 feet of blood vessels in each square inch of human skin.
Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.
Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.