Happy Tau Day, everyone! Every June 28, a rogue fleet of math nerds makes its case for the abolition of arguably the most important irrational number in the world: pi. These men and women of the "tau" ...

"I know it will be called blasphemy by some, but I believe that pi is wrong." That's the opening line of a watershed essay written in 2001 by mathematician Bob Palais of the University of Utah. In "Pi ...

As the world celebrates Pi Day on Friday, a movement is growing that claims pi — or 3.14, the ratio of a circle's diameter to its circumference — is wrong. The Tau Day movement supporters — also known ...