finding the Higgs boson was done almost entirely with Linux

in June this year, scientists from ATLAS and their colleagues from another CERN experiment, CMS, announced they had found probable evidence of the Higgs boson, an important sub-atomic particle whose existence has been theorised for half a century but has never been observed. The news was hailed by none other than Professor Brian Cox as "one of the most important scientific discoveries of all time".
And - putting aside the small matter of building the LHC itself - finding the Higgs was done almost entirely with Linux. indeed, many of the scientists we've spoken to say it couldn't have been done without it.
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