Celebrate Pi Day and read about how this number pops up across math and science on our special Pi Day page. For more than two millennia, mathematicians have produced a growing heap of pi equations in ...

Today, our Facebook feeds will be peppered with references to Pi Day, a day of celebration that has long been acknowledged by math fans and which Congress made an official holiday in 2009. Every ...

March 14 is no regular Pi Day this year. Math enthusiasts everywhere are celebrating the event as Ultimate Pi Day, because the date will correspond to the first five digits of pi (3.1415) rather than ...

When someone wishes you a "Happy Pi Day," you probably immediately think of circles—and not only pies. (Pi Day is March 14, or 3.14 if you’re using US date formatting.) That's because if you measure ...