SAN FRANCISCO -- Every March 14, mathematicians, scientists and math lovers around the world celebrate Pi Day, a commemoration of the mathematical sign Pi. That's because the date written numerically ...

We've seen a gorgeous mosaic and a tiger dominated poster for Life of Pi, but now some other animals get the spotlight on three new posters for the adaptation from Brokeback Mountain director Ang Lee.

Mathematician Carlos Castillo-Chavez says that pi is so important to math that using its simple, geometric definition denies its greater powers. "[Pi] brings you into the world of mathematics, which ...