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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Illicit drug use costs the United States approximately $181 billion every year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.