Some people spend their whole lives in a city. For others, though, visiting a big city--with its skyscrapers, subways, and crowds of people on their way to work or school--is like stepping onto another planet. For the narrator of this guide to urban life on Earth, that's exactly what it is--because this look at cities is told from the perspective of an alien! This unique approach to elementary social studies concepts gets young readers thinking creatively and critically about how they would explain life in a city to someone from another world.