I would say that it is the density of the water particles in the air. Where I come from (UK) mist tends to be thought of as thinner than fog - you can see further in it. Both are formed by water condensing in the air when the temperature drops.
Fog is more like a cloud that is at ground level.
You also see mist form in a layer above water, where evaporating water from the surface stays close when the air is still.
If you are interested, wiki has a good summary.
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.