But it's been left behind. I haven't heard anyone talk about metric conversion in years.

...except for those NASA guys who lost their Mars probe because somebody measured speed in furlongs per fortnight or something like that...

...or the Air Canada flight that almost crashed because the fuelers had mistaken kilos for pounds. It's a pretty amazing story. I once saw a TV-movie based on it, and thought it was a bad movie full of unbelievable coincidences, one of the worst clones of the standard Hollywood disaster movie, but then I heard it was a true story. A prime example of truth being stranger than fiction...

/Pepijn