Wiley publications celebrates the beauty of numbers and how it shapes our world in this article. You can directly skip to the article here .

The featured image is borrowed from http://anneskyvington.com.au/golden-ratio-in-nature/.

I found this article in the Notices of American Mathematical Society(AMS). It samples and studies types of mathematical humours common with mathematical folk as well as with outsiders. Have a look for yourself:

Foolproof: A Sampling of Mathematical FolkHumor

The featured image is borrowed from XKCD comics.