March 14 is Pi Day. It is to honor the ratio of the circumference of a circle "Pi" which is 3.14159.The only day in this century that matches pi is exactly two years ago, March 14, 2015 (3-14-15).

In fact, museums and schools have been planning to celebrate the concept according to NBC Washington. Pi has fascinated humans for ages. Besides, there are many things you have not yet known about pi. Here are some:

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Pi is discovered by unknown

No one is certain who discovered it, but we know that it was used by Egyptians during the construction of the Great Pyramid. On the contrary, it was said that astronomer Archimedes may be the one who discovered it around 250 B.C.

Pi can determine your identity

The identity of an individual can be found in the pattern since pi is a continuation of numbers. A theory posits that pi contains digits that can manifest all number combinations. On the contrary, Professor Strogatz claimed that it has nothing to do with an individual's life or identity.

Pi truly exists

Pi can be proven with toothpicks, pens, matches, or anything else for as long as they have the same length according to the author of "Why Pi? (Big Questions)" Johnny Ball.

How to celebrate Pi Day

According to USA Today, NASA issued a Pi in the Sky Challenge allowing you to celebrate like a rocket scientist. A series of math problems may be solved by NASA scientists and engineers using pi. On the other hand, it was suggested that you can also celebrate by making your own "Pie Day!"