When accumulating long time intervals with many time and/or energy bins in the spectrum object, you may run out of memory. In order to get around this, you can make several separate accumulations, write a FITS file for each and then merge the FITS files together using the FITS paster routine. More.
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.