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Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Did you know?
About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
Did you know?
There are more bacteria in your mouth than there are people in the world.
Did you know?
Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.