A blackboard at a U.K. university is believed to be the only one of its kind that has both Albert Einstein's scientific notations and his signature.

Pi Day itself dates to 1988, when physicist Larry Shaw began celebrations at the Exploratorium science museum in San Francisco. The holiday didn't really gain national recognition ...

You don’t have to be a mathematical whiz to calculate the savings Angelenos can score on pizzas and pies on Pi Day, which ...