I just learned that the process of going metric is called metrication.
Also, that there's a traditional Chinese unit of time, the ke, which was traditionally equal to 1/100 of a day, or approximately 15 minutes.
Also that there are only three remaining nations (according to Wikipedia, anyway) that don't widely use the metric system: the US, Liberia, and Myanmar.
And that in some stretches of Interstate 19 in Arizona, "distances are given in hundreds or thousands of meters, and not miles or even kilometres."
While I'm here, I may as well mention that the US Navy (again according to Wikipedia) measures distances in "kiloyards."