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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.