It depends on your space, guinea pigs can get pretty big and the need room, hamster do too, but no quite as much as guinea pigs since they like levels in theirs cage. (tunnels and platforms). I personal like Hungarian dwarf hamsters.
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.