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Veritasium - The American Kilogram
Seizoen: 2017 - Aflevering: 12 / 224 - Eerst uitgezonden: 10 mei 2017 - Episode ID: 1523683
The US signed the metre convention and bases all customary units on SI standards. As an aside, the Utah constitution from 1895 required the metric system to be taught in schools. This requirement was repealed in 1987. ¯\_(ツ)_/¯