Now, Teotihuacan ends up declining or falling before the Mayan civilization. You see Teotihuacan in this blue-green line. You see the Mayan civilization in this light blue, and then in the classical period, this slightly darker light blue. And Teotihuacan collapses around 550 in the Common Era. And the best theories we have today is that it might have been some type of an internal uprising maybe due to some type of drought and famine, and you can imagine people will revolt if they're not able to get enough food. Now, the Mayan civilization, it is believed, also started to collapse a few hundred years after that. So as we get into the 800s, the Mayan civilization, we believe, might have experienced some similar things, maybe some drought, some famine, that similarly caused uprisings, division, and allowed that to collapse.