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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
There are more bacteria in your mouth than there are people in the world.
Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.
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.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.