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There are 60,000 miles of blood vessels in every adult human.
According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.
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).
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.