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 ruler.
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.
Read more: <https://en.wikipedia.org/wiki/Pi>
Today's selected anniversaries:
Two days after becoming the first recorded European 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.
Gia Long conquered Hanoi and unified modern-day Vietnam, which
had experienced centuries of feudal warfare.
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.
American serial killer Jeffrey Dahmer was arrested in
Milwaukee, Wisconsin, after police discovered human remains in his
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
Wiktionary's word of the day:
(music) A poem or song having a line or phrase repeated at regular
Wikiquote quote of the day:
It is better the truth should come little by little. I have learned
that, being a priest. Perhaps, in the old days, they ate knowledge too
fast. Nevertheless, we make a beginning. It is not for the metal alone
we go to the Dead Places now — there are the books and the writings.
They are hard to learn. And the magic tools are broken — but we can
look at them and wonder. At least, we make a beginning. And, when I am
chief priest we shall go beyond the great river. We shall go to the
Place of the Gods — the place newyork — not one man but a company.
We shall look for the images of the gods and find the god ASHING and the
others — the gods Lincoln and Biltmore and Moses. But they were men
who built the city, not gods or demons. They were men. I remember the
dead man's face. They were men who were here before us. We must build
--Stephen Vincent Benét
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