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Did you know?
Vaccines prevent between 2.5 and 4 million deaths 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?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
The FDA recognizes 118 routes of administration.
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).