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Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.