|
|
Did you know?
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
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?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.