from Steven Strogatz's column:
http://opinionator.blogs.nytimes.com/2010/04/04/take-it-to-the-limit/

[![pi][2]][1]


  [1]: http://graphics8.nytimes.com/images/2010/04/04/opinion/04strogatz5/04strogatz5-custom1.jpg
  [2]: https://i.sstatic.net/KQscY.jpg