Every "message" event should have an origin property attached containing the url from where the message come. You could probably use this to find the iframe sending this message.
The event should also have a property "source" that can be compared to the iframes "contentWindow" property.
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.