RoabeArt [he/him]

Sometimes mold growing around the perimeter of a socket or switch is a sign of moisture behind that wall (poor insulation, water seeping from a leaky pipe or a hole in the roof…). I’ve never seen it form a ring like that though, usually it’s right on the edge of the outlet plate.

Electromagnetic induction.

A “vegetable” is simply any edible part of a plant. Fruits can therefore be considered a subcategory of vegetables.

If you really want to get into the nitty gritty, an ear of corn is botanically a fruit, since it’s the seed-bearing body of a plant. But nobody in their right mind would consider corn a fruit.