Most Safari books fill up one slot on your Bookshelf; some fill half slot, two slots or three slots. Suppose you have purchased a subscription for a 10-slot subscription for one year. If you choose only 1-slot books, and swap aggressively, you can use 120 1-slot books during the course of the year.
If your mix favors -slot books, you'll have access to more than 120 books during the year. Likewise, if your mix tends toward 2-slot or 3-slot books, you will have access to slightly fewer books.
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.