The world has a lot of different standards for a lot of things, but I have never heard of a place with the default screw thread direction being opposite.
So does each language have a fun mnemonic?
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Solang das Deutsche Reich besteht, wird die Schraube rechts gedreht.
That’s a lot of extra words for lefty loosey, righty tighty.
And how are we supposed to turn screws nowadays?
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Don’t you dare give them ideas
Wenn das der Kaiser wüsste!
I guess we’re screwed