You've brought up something that I am very resentful of about the US. Years ago, they announced that they were planning to switch to the metric system. The Canadian government then announced that Canada had no choice but to change to the metric system too as the U.S. is our major trading partner. So Canada went ahead and made the change and then the U.S. changed its mind and never did make the change. I was a young woman who had been brought up with the imperial system, and did not have a very scientific kind of a mind, and I had a terrible time learning to deal with some aspects of the metric system - to this day, if I shop for two pounds of meat, I don't have any idea of the weight in kg. and have to ask the butcher! Temperatures, sizes, and distances I've begrudgingly learned to deal with! I know you're absolutely right in saying that the metric sense makes a lot more sense, but allow me my old lady biases. I'm coming around, slowly but surely!