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The human body produces and destroys 15 million blood cells every second.
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Medication errors are three times higher among children and infants than with adults.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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.