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There are 20 feet of blood vessels in each square inch of human skin.

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Medication errors are more common among seriously ill patients than with those with minor conditions.

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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

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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.

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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