My suggestion is to use a concurrent nsoperstion. I have a demo app on github that shows how to message such an object. You will find many such projects too.
You can then use the performSelector variant that takes a thread specifier (the thread for such an operation is persistent).
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.