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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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There are more sensory neurons in the tongue than in any other part of the body.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.