July 22: Feast day of Mary Magdalene; Parents' Day in the United States (2012 -- FEC

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Date Posted: 03:20:29 07/22/12 Sun
Author: Pi Approximation Day (Sunday=42 wk29)
Subject:

July 22: Feast day of Mary Magdalene; Parents' Day in the United States (2012

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π (or pi) is a mathematical constant that is the ratio of a circle's circumference to its diameter. It is approximately equal to 3.14159. π is an irrational number, which means that it cannot be expressed exactly as a ratio of two integers, although it is roughly approximated by 22/7. It is a transcendental number – a number that cannot be produced with a finite sequence of algebraic operations (sums, products, powers, and roots). The transcendence of π implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straightedge. The digits in the decimal representation of π appear to be random. Because its definition relates to the circle, π is found in many formulae in trigonometry and geometry, such as Euler's identity, eiπ + 1 = 0. It is also found in formulae from other branches of science, such as cosmology, number theory, statistics, fractals, thermodynamics, mechanics, and electromagnetism. (more...)

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On this day...
July 22: Feast day of Mary Magdalene; Parents' Day in the United States (2012); Pi Approximation Day

1793 – Two days after becoming the first recorded person to complete a transcontinental crossing of North America north of Mexico, Scottish-Canadian explorer Alexander Mackenzie reached the westernmost point of his journey and inscribed his name on a rock.
1802 – Gia Long conquered Hanoi and unified modern-day Vietnam, which had experienced centuries of feudal warfare.
1934 – Bank robber John Dillinger (pictured), whose exploits were sensationalized across the United States, was shot dead by police in an ambush outside the Biograph Theater in Chicago.
1991 – American serial killer Jeffrey Dahmer was arrested in Milwaukee, Wisconsin, after police discovered human remains in his apartment.
2002 – The Israeli Defense Forces dropped a bomb on the home of Salah Shehade, the leader of the military arm of Hamas, killing him and his family.
More anniversaries: July 21 – July 22 – July 23

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