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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

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There are more sensory neurons in the tongue than in any other part of the body.

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The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

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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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