One suspects that for Cory Doctorow many of those truths have to do with magnificent trash, with the signposts, landmarks, and psychic Dumpsters of our time. The first story appearing in his collection, “Craphound” is a demotic hymn to junk culture, catching just right, in its buddy tale of homeboy scavenger and alien collector, the mix of casual affection, greed, and bafflement our throwaways, the myriad ephemera of our past, can engender. In “To Market, to Market: The Rebranding of Billy Bailey” a story tracking the classic sf trope If this goes on, schoolchildren undergo the sort of corporate sponsorship that’s now afforded sports figures and that litters our landscape with clever TV spots, fetching magazine ads, and a succession of inescapable logos resembling nothing so much as the diagram outlines of fighter planes passed out to WW2 civilian watchers.