It seemed to be this thriving civilization, perhaps the most extensive one. In other videos I talk about right now, the oldest wheel was discovered in Mesopotamia, but some people think that the wheel might have been used even earlier in the Indus Valley civilization. I talk about this period as early as 3300 BCE, but there's evidence that the civilization started much earlier. In the site right over here in Merger, right over here in Pakistan, they think that humans were having simple villages and agriculture as early, there's evidence as early as 7,000 BCE. And that site was discovered just in 1974. We might discover things that take us even further in the past. And when you have a civilization that was around for so long, if there were people there as early as 7,000 BCE, we're talking about it was there for thousands of years, but all of a sudden it starts to decline.