One simple way to do the synchronization, is to pass the timestamp of the last update to the server. The server then either gives an empty response (no updates), or a list of objects that where updated since that timestamp. In both cases, it gives a new timestamp, so the client doesn't have to stay in sync with the server.
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.