First there were Content Delivery Networks (CDN), that sped up delivery of content to end users with edges around the world. 

Those edges weren't fully utilized and the idea of edge computing came to be. Why not use that extra capacity of the edge nodes for computing? 

"Mom, why are you stretching?"

"Stretching feels good. Sometimes, if things hurt, stretching makes you feel better. Walking too."

There are four nucleic acids used as the rungs in DNA, CATG. I remember them in that order because cat-g works for my noggin.

I also remember which go together by the shape of the letters. T and A are all angular, so they go together. C and G are round, so they go together.

How do routing tables get populated? What are autonomous systems? What do colorful cubes have to do with anything?