I recommend reading up on how 'this' works. If nobody's been messing with it the 'that' of that. Callback refers to the parent object which is labeled with a literal string as 'A GMailInterface object can' .
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.