Mathematical Numbers

Task:  

Do some research on important numbers in mathematics. Choose one that is interesting to you (it can be on e or pi or a different number)

Share what you have found out about the number, for example, its history, some trivial facts about the number, and/or how it is applied.

To get started in your research, below are some sources you can use.

http://www.popularmechanics.com/flight/g163/13-most-important-numbers-in-the-universe/

https://youtu.be/wISqQRj_AkI

https://www.scientificamerican.com/article/let-s-use-tau-it-s-easier-than-pi/

Minimum of 150 words