It was either 'go with the title or come up with another one', and I was too tired to argue.

By the way, the paper was really an excuse to document this IJulia notebook.

http://nbviewer.ipython.org/urls/raw.github.com/jiahao/ijuli...

If you run it on your local machine, one of the cells has an interactive slider that lets you control the breadth of the parallel prefix tree you generate.