I really wish the world (read that as the US) would just stop fooling around and adopt the metric system
...I completely agree. Seems the US finds learning from the rest of the world a sign of weakness or failure.
The U.S. officially adopted the metric system somewhere around the 1930's, I think. But like many populaces, we use both in everyday practice. We buy Pepsi in 2-liter bottles but milk & gasoline in gallons. We measure the "grams of fat" and "mg of sodium" in a Quarter-Pounder (a McDonalds hamburger). We give a pint of blood but receive cc's of plasma. Our wrenches come in both "mm" and "in". Our speedometers show both kph and mph. Cocaine is sold on the street by the "kee" (kilo[gram]), but pot by the ounce or pound.

btw ... the day I can't buy a pint in a pub in Britain will be a day I shed a tear.