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Re:Oil Demand for Cars Is Already Falling by josho on Saturday November 17, 2018 @09:57AM (#18475757)
It is a skill. And a rather easy one to learn.

E.g. I’ve completed some basic carpentry projects. At the start I couldn’t have told you how much ⅛ of an inch was. Now I’ve got a good feel for that length. There is no reason why I couldn’t have learned what ½cm looks like instead as both are equally arbitrary.

Re:Oil Demand for Cars Is Already Falling by rleigh on Saturday November 17, 2018 @03:13PM (#18477138)
I wouldn't describe an inch as arbitary, but it is customary. And variable before standardisation with different sizes of thumb! The basis of the metre in comparison is definitely arbitrary!
Re:Oil Demand for Cars Is Already Falling by FullyFunctional on Saturday November 17, 2018 @05:43PM (#18477762)
I grew up in Denmark and have a fine-tuned sense for metric measurements (1 mm, 1 cm, and 1 meter). In my small town is more common for craft people (~ "contractors") to compete on who had the more accurate eye measurements. It's truly a sight to behold.

TL;DR: any measurement unit can be learned; Metric strength in the simplicity of conversions.