I think I could learn 2 dozen, but only the basics of them. The real challenge is in keeping them active. I think my maximum would be 10, provided I'd speak every one of them at least one entire day every month.
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.