John Baez is a mathematician founder of a field, and here talks about 8 which is a favorite number. Most of it's comprehensible to non mathematicians too, and it enable this anon to understand that numbers are in a sense alive, each is unique and has a specific relation to all the others etc. 
8 is considered a lucky number in Asia, while in the US ... 

https://youtube.com/watch?v=2oPGmxDua2U