Unwind segues use runtime searching by first asking the parent view controller to walk up the chain of view controllers presented via segue until it finds the correct unwind method. But there is no chain here since the popover was created programmatically rather than with a popover segue.
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.