China alert over bird flu death

Chinese authorities shut down and clean poultry markets in Hebei province, after the first human death in nearly a year.

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Poetry or science?

Is romantic love just a chemical cocktail?

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First flight of algae-fuelled jet

Continental Airlines is the latest to test fly a jet biofuel, this time with a product derived partially from algae.

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Holes give edge to new armour

Scientists from the UK Ministry of Defence (MoD) have devised ultra-hard vehicle armour to protect military personnel.

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'Wolfman' returns

Explorer Jim McNeill tracks down Arctic wolves

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Animal matters

Scotland's debate over tests on primates

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Mummy of female pharaoh uncovered

Egyptologists find remains of a mummy thought to belong to a queen who ruled 4,300 years ago, Egypt's antiquities chief announced.

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Baby Jupiter's huge weight gain

The planet Jupiter must have gained mass fast during its infancy, according to astronomers.

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Earth Watch

Why it is hard to predict sudden environmental crises

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Black holes 'preceded galaxies'

Astronomers believe they have solved a cosmic chicken-and-egg question: what came first - black holes or galaxies?

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Venomous mammal caught on camera

Rare footage of one of the world's most strange and elusive mammals is captured by scientists.

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Feilden's blog

Ground-breaking new technique in stem cell science

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Beagle hunter

On a mission to find the most famous ship of science

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Eat it or lose it - why centuries of crop diversity are at risk

Centuries of crop diversity are at risk of being lost forever as farmers turn to just a few modern, high yielding varieties.

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US vows 'huge' marine protection

The US is to establish "the largest area of protected sea in the world", banning fishing and mining, around its Pacific islands.

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Panda bites his third tourist in two years at Beijing zoo

A panda at Beijing zoo bites a man for the third time in two years.

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Tech fair offers greener vision

Analysts at the Consumer Electronics Show say green credentials of tech products will become critical to success.

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Heat may spark world food crisis

Half the world's population could face food crisis by 2100 as soaring temperatures cripple staple crops, scientists warn.

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A deep-sea fish caught in the Pacific has mirrors for eyes

A deep-sea fish caught in the Pacific has eyes which use mirrors as well as lenses, scientists discover.

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Zimbabwe troops 'eat elephants'

A Zimbabwean wildlife campaigner tells the BBC that soldiers are being given elephant meat to eat, as the economic crisis deepens.

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Everest trip helps critically ill

Blood oxygen levels recorded on a trip by medics to Everest could help the treatment of critically ill patients.

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Our writers talk back

Some of the previous contributors to the Green Room respond to readers' questions and comments.

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Mosquitoes make sweet love music

Sexy songs sung by mosquitoes in courtship could be key to curbing the spread of dengue fever, say scientists.

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Body repair 'could be ramped up'

A combination of drugs could trick the body into sending its repair mechanisms into overdrive, say scientists.

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Canadians claim South Pole record

A trio of Canadians claim a new record for the fastest trek across Antarctica to the South Pole.

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 Science > Math > Recreations > Specific Numbers > Pi

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Science > Math > Recreations > Specific Numbers > Pi

Pi:

Ancient Pi: Knowers of the Universe

The concept of pi refers to the constant ratio of the diameter:circumference of any circle; irrespective of the number of degrees contained within that circle. An article in the "Science in Ancient Artwork"-Series by Charles William Johnson.

http://www.earthmatrix.com/ancient/pi.htm

Graand

Free Classified Ads Portal

www.graand.com

Ask Dr. Math - Pi

Dr Math answers over 60 questions submitted by people about pi including questions on the Bible's relationship to it and its relationship to trigonometry.

http://mathforum.org/library/drmath/sets/mid_pi.html

Ask Dr. Math: About Pi

Explains what the constant is and a brief history. Includes resource links.

http://mathforum.org/dr.math/faq/faq.pi.html

Buffon's Needle

An analysis of its relation to Pi and a simulation by George Reese.

http://www.mste.uiuc.edu/reese/buffon/buffon.html

Calculating Pi

An open source endeavor for the calculation of this constant. Describes the project, the implemented algorithms for calculatinon and software downloads.

http://sourceforge.net/projects/projectpi/

A Common Book of Pi

Includes a brief history, a page with different formulas and a list of references.

http://personal.bgsu.edu/~carother/pi/Pi1.html

The Constant Pi

History, formulae, algorithms, programs, records of computation, and references.

http://numbers.computation.free.fr/Constants/Pi/pi.html

Dale's Pi Page

Includes history of Pi, songs and jokes, poems, news and the first 1,000,000 digits.

http://www.geocities.com/SiliconValley/Pines/5945/

Earth Mysteries : Notes on Pi

An introduction to the number Pi and its history.

http://witcombe.sbc.edu/earthmysteries/EMPi.html

Elias' Pi Page

Includes Pi in the Binary number system, Pi as a sound file and Pi shown in different images.

http://www.befria.nu/elias/pi/

Fun With Pi

A Topica email list. Archives readable by anyone.

http://lists.topica.com/lists/funwithpi@igc.topica.com/

Harry Smith's Brief History of Pi Calculations

Brief history of Pi calculations from the ancient times to present day.

http://www.geocities.com/hjsmithh/Pi/Records.html

History and Philosophy of Pi

Probably no symbol of infinity in mathematics has evoked as much mystery, romanticism, misconception and human interest as the number and Greek letter of Pi. Interesting facts and trivia about Pi.

http://briantaylor.com/Pi.htm

How Pi?

Extracting the digits of pi from the SlOka

http://www.geocities.com/ResearchTriangle/Facility/4118/misc/pi.html

How Stuff Works: Pi

Animated graphic helps to explain Pi and the different ways of calculating Pi, with some related links.

http://www.howstuffworks.com/pi.htm

Indiana Pi Bill

Bill proposing new value of pi.

http://tafkac.org/legal/indiana_pi_bill.html

The Joy of Pi

Book, digits, links, facts, and quote.

http://www.joyofpi.com/

Land of Pi

Pi digits, random links, and some downloads.

http://www.geocities.com/landofpi/

Lucy Scale Developments

Pitch, Pi, and other musical paradoxes.

http://www.harmonics.com/lucy/ltindex.html

The Magic Piworld

Provides generated pictures and personal signs out of digits of Pi. Also a Picture Gallery, PiSign, PiPhonie.

http://www.piworld.de/piworld/mpw_home.htm

A New Approach to the Universal Constant "pi"

A text that tries to prove that pi is 3.1416 exactly.

http://alkyone.com/mak-pi-gr/en/

Pi 3.1416

Mathematics as the language of nature.

http://www.freewebs.com/pi3point1416/

Pi Approximation Day

22/7 - that is, July 22. For the past few years, people at Chalmers University have celebrated it.

http://www.rebas.se/humor/piapprox.shtml

Pi Land

Fun activities, a Pi trivia game and a Trainer for digit memorization. Pi poetry, artwork, and photography, calculations, digits and book reviews.

http://www.eveandersson.com/pi/

Pi Memorama

Includes a program that teaches Pi for the Mac, a page on why people learn to recite Pi and pages on how to memorise Pi.

http://www.ac.wwu.edu/~mnaylor/pi.html

The Pi Pages

Information on Pi, its history, its future, and the people involved in its calculations.

http://oldweb.cecm.sfu.ca/pi/pi.html

Pi Patterns

Images and illustrations created by using the digits of the circle constant.

http://www.antigravitypress.com/Math/pi/

Pi, Pi, Mathematical Pi

Parody of the song "Bye Bye Miss American Pie" elaborating on the history of pi.

http://www.vvc.edu/ph/TonerS/mathpi.html

The Pi Song

Written by Joel Gilmore. (Sung to the tune of Supercalifragilisticexpialidocious.)

http://www.physics.uq.edu.au/people/gilmore/humour/the-pi-song/

Pi Through the Ages

History.

http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Pi_through_the_ages.html

The Pi Trivia Game

History, math, and physics questions.

http://www.eveandersson.com/trivia/

Pi World Ranking List

Every sport has its championship. Every sport has its world ranking list. For many who like to memorize numbers, PI is the ultimate number, and it makes sense to create a list for people to get in touch and learn where they stand in the world of memorizers.

http://www.pi-world-ranking-list.com/

Pi-Dye : Pi and Math T-Shirts and Gifts

Pi and math gifts, t-shirts, clocks, and mugs. Includes some pi news.

http://www.pidye.com/thestorezone/index.php

The Ridiculously Enhanced Pi Page

Information on links for Pi Day.

http://www.exploratorium.edu/pi/

A Slice of Pi Home Page

Features an historic overview of the discovery and estimate methods of pi. formula expressions, and the first 100,000 digits. Some pages use a Geometer's Sketchpad program.

http://www.geom.uiuc.edu/~huberty/math5337/groupe/welcome.html

Three141, a BBP Ruby implementation and a portal about Pi

A Ruby implementation of BBP (Bailey-Borwein-Plouffe formula) and a portal about the Pi. The BBP formula calculates the nth digit of pi without having to retain all the previous digits.

http://www.314159265358979323846264338327950288419716939937510.net

A Tribute to Pi

Club and information.

http://www.acc.umu.se/~olletg/pi/trib.htm

Your Piece of the Pi

This site describes pi's history, characteristics, and application. It also includes a distributed computing application for finding a large number of digits.

http://library.thinkquest.org/C0110195