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What's the usual color of dirt/ground? Brown
Funny you mention that. I've also pondered on how brown might have been somebody's idea of a good color for earth/ground, but the English-speaking world just settled on green instead.

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the trick of the german lightbulb fittings is that the contact for the outer thread is not where it's turned in, but at the bottom next to the center contact.

Here's the typical European ES holder:

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