This day only comes 'round' once every year!

Add Yahoo as a preferred source to see more of our stories on Google. Calling all mathematicians, a day where math and food meet is finally here! March 14, National Pi Day, honors 3.14 (π) the ratio ...

Some numbers are useful. Some are famous. And then there is pi, a number so absurdly powerful that humanity has spent ...

One of my favorite holidays is Pi Day. On March 14, people who love the math constant called pi celebrate by eating the other kind of pie. Like apple pie, pumpkin pie and even pizza pie. I talked ...

Friday is Pi Day, a national celebration of the mathematical concept, which is the ratio of a circle's circumference to its diameter and equals 3.14... Schools and museums often plan events to ...

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 ...