How can I find out in which hubs people are clicking Google ads?

The easiest way is to create url channels in your adsense account for each hub. This hub explains it well: hubpages.com/hub/How-to-Use-Adsense-Channel.

An even easier way is to link your Google AdSense and Google Analytics accounts, you can follow the steps to take here: google.com/support/googleanalytics/bin.

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.