The hubs with the most traffic are the ones that earn you the most money. This is because you earn for every person who visits your hub. This is called "pay per impression" whereas AdSense pays per click.
That's a good question. The only way I can think of to track which hubs are earning HP Ad Program money is to do it through Google Analytics. It won't be an exact correlation between your hubs and HP Ad Program income, but it will tell you which hubs are getting the most traffic and therefore views/impressions, which, as melbel stated, is how the HP Ad Program pays.
From that you can extrapolate which hubs are your top HP Ad Program income earners. Hope that made sense. I'd be interested in seeing how other hubbers answer this.
HP Ad program pays based on impressions. Google Analytics is the best tool to keep track of which Hub gets more impressions, As the fellow hubber told, this may not be 100% exact but the nearest you can get.
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.