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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Your heart beats over 36 million times a year.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.