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There are more sensory neurons in the tongue than in any other part of the body.
The familiar sounds of your heart are made by the heart's valves as they open and close.
There are 20 feet of blood vessels in each square inch of human skin.
Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.