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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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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.