Pi Day celebrates the mathematical constant π. First marked in 1988, it became an official US holiday in 2009, encouraging ...

Pi Day was first celebrated in 1988 at San Francisco's Exploratorium, a museum of science and technology that encourages visitors to be hands-on.

On March 14, 1879, Albert Einstein was born in Ulm, Germany. His thinking revolutionized physics and turned the scientific community away from the macro world of Newtonian physics into the micro world ...

News 9 celebrates Pi Day on March 14, discussing the number pi's significance and inviting viewers to enjoy pie in honor of the day.