Someology

I find that the entire category of auto-immune diseases are a thing most people fail to really “get”. Especially if it is even moderately uncommon.

Being able to recognize poison ivy. Growing up in a forest, it was one of many basic automatic skills learned in childhood, and I see and avoid it without much thought. I’ve had to prevent many friends from other regions or countries from causing themselves serious harm by ignorance of poison ivy, though.