Blood is approximately twice as thick as water because of the cells and other components found in it.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).