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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.