Forty five years ago I was certain that the USA would be all metric within five years. It has come a long way but it only amounts to having to know both systems in this country.

Automobiles are almost all metric now but there are many things that have never changed

A lot of the model airplane engines still have english thread sizes on the prop nuts

The world would be much more simple without the USA system of measurement as well as 60 cycle alternating current, the odd voltage levels, and the different scan rates of video displays