Linux is the Operating System of choice for Supercomputers like the Tianhe-1A

Reading about the Tianhe-1A today, and noticed that most of the Top 500 computer systems run Linux.  It is no secret that Linux has been my operating system of choice since I was a poor Student.  I found this graph showing Supercomputer Operating Systems to show that people with very large budgets like it just as much.

Warning, you might need a magnifying glass to find windows and mac on this chart:  

Side note:  I still pronounce Linux wrong and probably will forever.  The red neck in me I guess.  When I first started using it, it was new enough that no one I talked with physically in rural Utah could correct me.  When I was at SUU, one of my favorite professors tried but old habits die hard.