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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
The longest a person has survived after a heart transplant is 24 years.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.
There are 60,000 miles of blood vessels in every adult human.