Pi Day is celebrated on March 14th each year - today we celebrate mathematics in general and the mathematical constant that starts with 3.14 and goes on for infinity.
Archimedes did one of the first calculations of pi as between 3 1/7 and 3 10/71
Some believe the ancient pyramids in Egypt were built on the principles of pi.
Coincidentally, the day of pi is Albert Einstein's birthday-he was born March 14th, 1879.
Pi Day is celebrated in our home with warm apple pie.