Watch the video below, in which John Green will teach you about water. 

You might wonder what this has to do with Mayan civilization. One theory about why the Mayan civilization collapsed has to do with water management issues. It is an interesting lens through which we can look at the Maya. 

Green compares the water issues of the Maya to those that the Khmer civilization of Southeast Asia. It is worth watching the entire 11 minute video, but you will only be responsible for the material up to the 6:40 mark.