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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.