And that's where you're going to get government and religion and politics and really the fundamental building blocks of civilization. So let's talk about the city-state just for a few minutes here, kids, because it's really, really important. Now, the city-states, in a sense, are like little nations unto themselves that do share some commonalities. But some of those commonalities are really important. Now because of cultural diffusion, they had trade routes. They bring back this kind of religious idea from outside of Sumer of being polytheistic, of worshiping many gods. And I'm not talking about three or four gods.