How do I use django mptt?

I don't quite follow your question. A tree stores one type of object, in your case Company. To link Financials to Company just add a foreign key from Financials to Company.

I asked a similar question here: http://stackoverflow.com/questions/291249/django-how-do-i-model-a-tree-of-heterogeneous-data-types.

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.