So we're just trying to figure out what we can from the archeological evidence. Now near the time that the Chabin culture started to decline and what's interesting, we believe that a lot of these cultures declined either from warfare between themselves or some type of climate change, whether it was the El Nino or some type of drought or famine. And maybe that could actually cause a lot of the conflict within a society as well. But those are some of the leading theories as to why the Chabin culture ended around 200 BCE. Now around that time, we start to see the emergence of several other cultures. You have the famous Nazca culture emerge right over here in southwest Peru. And they're most famous perhaps for the Nazca lines, these huge, I guess you could say drawings or patterns that are made in the land.