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I agree. The American reluctance to metric units is strange and I appreciate the mathematical elegance of ISO paper sizes, but letter paper just feels more pleasant on the eyes than A4.

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> American reluctance to metric units

Reluctance is too strong a word. In the US we use metric for quite a lot of measurements. Frequently things are labeled in both metric and imperial. What we have is ambivalence. Folks from countries with more metric adoption care way, way more about the US using imperial than anyone in the US does.

I dunno about ambivalent. Tell a US person it's 30° outside in the summer and at best they'll give you a blank stare, at worst they'll say "well no it's gotta be warmer than that out." They don't learn it, so no one uses it. If schools taught it then it might catch on. The food labeling stuff is for regulatory reasons, the only metric units US people actually use are liters for beverages.

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