It said that the Thread eats or whatever, burns up, any organic thing it finds, so if there was a Threadfall in the beginning, how did anything survive at all?
When humans came, they were in the middle of an Interval.
But if it kills everything that's organic then the humans should have died out too.
Oh, that's what they were talking about in the beginning of the book! I get it now. She's like, "They don't even make their things out of stone anymore." I'm like, "So? Why does that matter?"
I kind of like that. I didn't like that because it was confusing, but at the end of the book, once you understand it, it makes sense. She just threw you into the world, and she didn't try to talk down to you. So it's confusing but once you get it, everything falls into place, and all their little pieces of conversation have a place.
That's what's unique about her style.