Does each language have "lefty loosey righty tighty"?
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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What's the phrase in French?
La main droite, c'est celle qui a le pouce à gauche
Not sure about the thumb one but for screws with only have: