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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 horizontal fraction bar was introduced by the Arabs.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.