Fruit or vinegar flies (diptera) have invaded my composter. Is this normal?

Yes, it's part of the process of decomposition and helpfull. Their larvae are voracious decomposers. In a rotating composter, they are restricted to a small area.

Avoid placing your nose directly above the door when adding to your BluePlanetSMART. 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.