Some of the best uses of D3 show understanding of every part of the process from getting, understanding, and cleaning the data, to thinking about its structure

Some of the best uses of D3 show understanding of every part of the process from getting, understanding, and cleaning the data, to thinking about its structure and designing interactions that let the user really get a feel for what is being presented. I think this project helps a little bit somewhere in the middle of the process, and ignores the rest of it.