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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.