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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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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are more bacteria in your mouth than there are people in the world.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.