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Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
Did you know?
In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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