I tried to have a balance of questions over these 6 areas:
* Biology
* Economy
* Environment
* Politics
* Science & Technology
* Society
I also tried to have a balance between questions that you would think for certain would be a 'yes' like the Pi one and a 'No' like the cannibalism one.
Layered on top of this was my own personal views on what's 'unusual' about our own society and a desire to get people actually thinking about us, not the aliens. Do we really need Jails and religion and countries? Is there another way? Maybe we could have a justice system without Jails, for example. That's what's behind the UN question - probably not a good question - but something I think about often.
I regret not thinking about the family question. That would have been a good one.