I recommend you this post: infoq.com/articles/grails-best-practices.
We are creating static methods in Domain class to encapsulate queries. Service are used only for transactional operations or very complex queries with multiple domains interaction. Controllers simply call domains or services methods.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.