It is one way to do what in a relational database you would do with a JOIN (something that you cannot do in MongoDB).
In simple terms, embed if its NOT a top level object, if it does NOT have complex relationships, if there will be a lot of duplicate data if you do NOT embed, and if your documents become bigger then a few megabytes.
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.