Celebrating Pi Day at Sal's Pizza in Boston 03:04. Today marks National Pi Day in the United States and around the world. The holiday commemorates a timeless symbol beloved by many in mathematical ...

Yet even after mathematicians worked out how to calculate pi accurately to over 100 decimal places at the start of the 18th century, we didn’t have an agreed symbol for the number. Math Pi-oneer ...

Pi Day is a holiday for math (and pie) enthusiasts to celebrate their love of numbers. And this year marks a once-in-a-century occurrence. Saturday at 9:26:53 a.m. the date and time will read 3.14 ...