We see everything from the narrator's point of view, so exposition about the world is limited to what impinges directly on him and the story he's telling. Considering how old the world is, we learn very little about its history, which I think is a good thing.
Neal StephensonEnoch...why are you here? Why has my spirit been incarnated into a physical bodi in this world generally? Or specifically, why am I here in a Swedish forest, standing on the wreck of a mysterious German rocket plane while a homosexual German sobs over the cremated remains of his Italian lover?
Neal StephensonMost of the brain's work is done while the brain's owner is ostensibly thinking about something else, so sometimes you have to deliberately find something else to think and talk about.
Neal Stephenson