I still remember when Canada introduced the Metric System... I was twelve years old. Old enough to have spent the previous 7 years learning the Imperial System of measurement in the classroom. Very frustrating to have to unlearn what I had learned and to learn a new system. That being said it was nice not to have to remember how many feet are in a mile, ounces are in a pound, pints are in a gallon, and other imperialistic idiosyncrasies. What the hell is a rod anyway? Five and a half yards? Does anyone actually use that? There's a good reason why the Metric System is considered the "Système Internationale."