Today marks National Pi Day in the United States and around the world. The holiday commemorates a timeless symbol beloved by many in mathematical and scientific communities, while making the most ...

Simply put, pi is a mathematical constant that expresses the ratio of a circle's circumference to its diameter. It figures ...

We’re a reader-funded news organization fighting an expensive lawsuit that threatens our survival. Our reporting remains fiercely independent, and is never manipulated by commercial or political ties.