Why can't we (the US) just go to the metric system already? We were supposed to switch back in 1975 and then dropped the whole thing. I am sure a lot had to do with the politics of the era, but I think the public resistance to switching systems was the conversions back and forth. We already know a 2 liter bottle of carbonated brown sugar water is a little over 2 quarts, our drugs have been measured in milligrams and milliliters for as long as I can remember, a meter is about a yard, and a kilo of cocaine is still a kilo of cocaine. If we could just switch then we could forget about the conversions and enjoy a flagon of ale or a dram of whiskey.