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Did you know?
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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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There are 60,000 miles of blood vessels in every adult human.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.