Ah, that's better. The way we answer that question ends up organizing all kinds of other thoughts, like what we should value, and how we should behave, and if we should eat meat, and whether we should dump that boy who is very nice, but insanely clingy in a way that he cannot possibly think is attractive, all of which adds up- Mr. Green, Mr. Green, are you talking about me? Yes, I am talking about you, me from the past. I am telling you that one of the reasons we study history is so that you can be a less terrible boyfriend, but more on that momentarily. Today we're going to talk about civilizations, but in order to do that, we have to talk about talking about civilizations, because it's a problematic word. So problematic, in fact, that I have to turn to camera 2 to discuss it. Certain conglomerations of humans are seen as civilizations, whereas, say, nomadic cultures generally aren't, unless you are, say it with me, the Mongols.