Verisimilitude
Worldbuilding can be tricky if you're writing science fiction or fantasy. There's so much to do—the readers are unfamiliar with the background, social mores and customs of the novel's environment and as such are at a disadvantage when it comes to working out what's going on. The characters themselves are no help. They know all this stuff anyway, so there's no way they are going to be able to remind each other of what they've known for years without sounding unrealistic. One solution is to use an omniscient narrator but then if you're not careful there's a temptation to fall into the "telling not showing" trap... Convincing worldbuilding is a skill that it can take years to master. However there is a way around this if you're in a hurry. If you set the novel in the real world you can take the background as read— everyone knows all this stuff right? —and concentrate on the actual story. Interestingly there is an added bonus of using this me...