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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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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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Everyone has one nostril that is larger than the other.
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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.