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Double Plug Experiment
(mander.xyz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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I was thinking it might just be heat from the wiring or plugged in devices keeping it too dry for the mold.
It could also be that they needed to mud/tape around the opening for the plug in the drywall/plaster and it changed the consistency/chemical makeup just enough to not be as friendly to the growth of mold (less moisture/denser etc)