Today (14th March) is Pi Day
Pi Day is celebrated every year on 14th March (written 3/14 in many countries) because 3.14 are the first three digits of the Greek letter pi, the famous number equals to 3.14159…...., that describes the ratio of a circle's circumference to its diameter.On this fun math holiday, many people eat pie (apple, pizza, whatever!), do circle-related activities, share math jokes, watch pi memorization contests and marvel at how this simple yet infinite number shapes bridges, planets, waves and even our phones.
Incidentally, Albert Einstein was born on the Pi Day in 1879.