I've been wondering that too! I know if you put fresh lemon juice on them it will preserve the color for a few hours, but I came across this website that tells you about freezing them, check it out. survival-cooking.com/2009/07/how-to-pres... How to preserve Avacado's.
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.