Today's featured article
 Illustration of the value of π
The number π (pi) is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter. It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, though it is sometimes approximated as 22/7. Its decimal representation never ends, nor does it enter a permanently repeating pattern. The digits of π appear to be evenly distributed, but no proof of this conjecture has been found. It appears in many formulae in mathematics and physics, and for thousands of years mathematicians have computed its value with increasing accuracy. Since the late 20th century, mathematicians and computer scientists have extended the decimal representation of π to many trillions of digits. Many equations from trigonometry and geometry rely on π, especially those concerning circles and spheres. A transcendental number, π is one of the most widely known mathematical constants. (Full article...)
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 Charlotte Brontë
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On this day...
March 14: Sikh New Year's Day; White Day in parts of East Asia; Pi Day
 Catherine Cornaro
- 1489 – Catherine Cornaro (pictured), Queen of Cyprus, was forced to abdicate and sell the administration of the island to the Republic of Venice.
- 1593 – Japanese invasions of Korea: A force of 3,000 Korean soldiers successfully defended Haengju Fortress against 30,000 Japanese invaders.
- 1885 – The Mikado, Gilbert and Sullivan's most frequently performed Savoy opera, debuted at the Savoy Theatre in London.
- 1945 – The Royal Air Force first used the Grand Slam, a 22,000 lb (10,000 kg) earthquake bomb, on a strategic railway viaduct in Bielefeld, Germany.
- 1991 – Escondida, one of the most productive copper mines in the world, was officially inaugurated.
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