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Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
Did you know?
Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
Did you know?
In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.