In that vein, any dietary restrictions that those around you don’t have, have a logical basis of furthering your in group cohesion and distancing yourself from your neighbors, just because sharing meals with people generally deepens relationships (or honestly, any restrictions of any type that differ from those around you serve to other you from them, thereby driving you together as a group). That is a scientifically substantiated benefit, but it’s not quite what I was getting at, because it’s not inherent to the rule itself, but rather how it applied in that specific context.

That said, I didn’t realize that about the textiles and it’s super interesting!

in which kind of regions?

Wet ones. Maybe slugs stay out of your home if the humidity is low? I wonder if a dehumidifier could be a slug repellant.

Much of Britain, certainly.

They can get through a gap of 1-2mm (about 1/32 - 1/16 inches) through cracks round door frames, along the holes for water pipes, in tiny cracks between bricks or concrete.

They have an amazing sense of smell and are especially fond of cat food or that tiny bit of lettuce that fell underneath the fridge.