As you get into the late third millennium, that's when you have the empire of Sargon the Great, the Akkadian Empire. As you get to the end of this mature period right over here, this is close to or around the time of Hammurabi, the Babylonian Empire. And in Egypt, if you go back to around 2500, around this time, that's when the pyramids were built. And you have the Egyptian kings, these god kings, that were ruling for most of this period right over here. And as we'll see, there was actually, we believe, a good bit of cultural interchange between these significant civilizations. Now just to appreciate how extensive this Indus Valley civilization was, I will show you this map. And this map, it's a zoomed in of that region around the Indus Valley that I just showed you.