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Re:Make the Metric system the standard in the United States by davidw on Wednesday January 02, 2013 @08:20AM (#4996500)
http://en.wikipedia.org/wiki/Metrication#United_Kingdom

Would indicate that the process has being going on for some 40 years and is still not at all complete. That to me indicates that it's not "easy" either.

Re:Make the Metric system the standard in the United States by curiousdannii on Wednesday January 02, 2013 @09:47AM (#4996903)
Then look at one of the many other countries that have completed it: http://en.wikipedia.org/wiki/Metrication#Chronology_and_stat...