I think of a Django "app" is a high level feature of a site. Say there is a site that offers Forums, Life Chat, FAQ, and an Image Gallery. I would create a separate Django app for each of those 4 features.
Each app can have, but doesn't necessarily NEED to have, it's own Models, Views, Templates (and potentially middleware and other things) that are all closely related and serve a single high level purpose.
The entirety of django.contrib. See http://docs.djangoproject.com/en/dev/ref/contrib/ for an explanation of what each app does.
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.