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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.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
Women are 50% to 75% more likely than men to experience an adverse drug reaction.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.