Pi Day is also the birthday of Albert Einstein ... A free slice of pie and live music from San Francisco’s Mission Delirium ...

Tuesday 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 ...

has new meaning on this Pi Day, which was celebrated yesterday. Emma Haruka Iwao, a Google employee, has broken the Guinness world record for calculating the most digits of Pi. Iwao and a Google ...