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Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
Did you know?
Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
Did you know?
Human kidneys will clean about 1 million gallons of blood in an average lifetime.