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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
On average, the stomach produces 2 L of hydrochloric acid per day.
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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.