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But I would happily adopt a base 12 number system with base 12 units. Let’s say we use X for 10 and Ǝ for 11, 134 would be 1Ǝ, 24 hour clock a 20 (base 12) hour clock
Now that I have a kid, my kid has not learned the word 'sitt'. :-)
Anyway, I wouldn't have made the news as this dad did: https://www.dailymail.co.uk/news/article-1229808/Linguist-re...
A system merely suitable for the human scale will never enable you to reach beyond.
Also fractions of metric values should be even better for the brain, if stuff does not cancel out as easily. so if you want to make the argument that not using a calculator is inherently better, its even better to not use a calculator using the metric system.