Aztecs please help!!?

I have to write a paper. We are looking at the Aztecs. For our paper we have to ask a question answer the question and provide proof as the main part of the paper. Could anyone help me think of a good question to ask about the Aztecs? It has to be on something that I can write quite a bit about. I am not asking anyone to give me info on them just a good question so I can write. Any help would be soooo appreciated.