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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
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Approximately 25% of all reported medication errors result from some kind of name confusion.