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There are more bacteria in your mouth than there are people in the world.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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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.

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The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

A schematic of the circulatory system illustrating the pulmonary circulation picking up oxygen from A schematic of the circulatory system illustrating the pulmonary circulation picking up oxygen from
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