Whereas we know the size of an inch and a mile, standardized dress sizes were developed and then abandoned in the United States.
Why the Metric Switch is so Tough
The expense and complexities of switching to the metric system have prevented the change, and have affected how standard weights and measures help globalization.
Why should you care about a tiny grain of sand?
Because commercial globalization needs standardized weights and measures, the mystery of the kilogram prototype getting lighter needs to be solved.