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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
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).
Did you know?
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
Did you know?
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
Did you know?
Your heart beats over 36 million times a year.