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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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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.