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The average office desk has 400 times more bacteria on it than a toilet.
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There are 60,000 miles of blood vessels in every adult human.
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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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In 1864, the first barbiturate (barbituric acid) was synthesized.