This is an article from Quanta magazine, but since all the article does is wrap the website* I prefer linking directly to the content.
I stopped learning maths after university so this is at a level I can appreciate and the animated illustrations do well to convey some of the points being made. The map itself is very high level though and I wonder if ti would be a good starting point to expand in more detail.
* The Quanta article - the only benefit seems to be adding comments and letting facebook, google and disqus track you. :\
Unrelated - I'm sure I used to be able to view all the tags available - to choose for a post and to choose to subscribe to. What happened to that? I can't find it. Note to self: https://hubski.com/tags It's obvious but not very discoverable.