Should I delete hubs with extremely high bounce rates?

Absolutely keep them! You never know when they might become popular.

Bouncing does not have to be bad, it just means visitors didn't go to a second page on this website (within the pages with your Google Analytics code). But they may have just found what they were looking for in your hub, they just bounce back to the search engine after that.

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.