I entered 9th grade in 1972. There was a big push to teach us the Metric system. Don't know why, but it never happened in the general population. But it is used in a lot of places, military, science, most vehicles have both metric and standard fasteners. Hell, even most drug dealers work in the metric system. I'm comfortable with either system and think we'd be better off had we changed. Once you figure it out everything is easier.
