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The human body produces and destroys 15 million blood cells every second.
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People about to have surgery must tell their health care providers about all supplements they take.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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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.