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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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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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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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