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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.
Did you know?
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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?
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.