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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.