Between Charlie Kirk and 9/11, this seems too mundane to put on FB, but I wanna say it and it's (nerdy) cool: early 20th century archaeology. My house was built in 1938. It was added onto twice--straight back, shotgun style. They tacked on 8 feet or so and then another 8 feet or so. My bedroom was originally the back of the house. Originally the steps to the basement intruded on the kitchen but when they added on they moved the basement steps to right behind where my (now drywalled over) back bedroom window used to be. So I could put a secret compartment right over my bed. Or a recessed bookshelf. But that's another story. The point is, there was maybe 4' to the left of the basement steps that, for lack of a better use, they turned into a 16' long hall closet.
Since I'm a geek, and my bedroom closet is tiny, I hit on the idea to cut a hole between the hall closet and my bedroom, panel the wall behind my bed and have a secret door to a big ass closet-escape from my bedroom to the back door. Clear? It really doesn't matter. The point is that I've been exposing the back side of the drywall in my bedroom for a long time now and I hit on a realization today. This is some whacky-ass drywall.
I assume it dates to 1938, when the house was built, because it makes sense that my bedroom was an original part of the house. It is not plaster & lathe. It is not the weird 50s/60s drywall with a metal mesh and plaster. It is 17" drywall boards, laid horizontally, like siding on a house. I assume they're 8' long but can't tell. I can only tell that there's a seam between sections of drywall every 17" or so. Wild. So in Olden Dayes they definitely laid a coat of plaster over the drywall. Which may explain why the walls in my bedroom could probably stop bullets.