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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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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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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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There are more bacteria in your mouth than there are people in the world.