Gravel actually isn't necessary. It's actually better without as it's easier to clean then. Most aquarists that use gravel like it for the looks.
But if live plants are involved a substrate is needed to hold the plants down and to hold nutrients.
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.