Identical twins get dealt exactly the same DNA, but they may develop different traits down the lineóone may have allergies and the other may not, one may develop a particular disease and the other may not, one may be able to play the piano without ever learning how to read music while the other can't carry a tune with a dump truck. What accounts for these differences is something in their environmentópotentially as early as in uteroóaffected the expression of their genes differently. That something is called epigenetics.
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.