Yes, they probably keep records for several days. Also, it is most certainly cached elsewhere on your machine - to bad it's a mac or I could tell you where. Anyways, it's probably nothing to worry about unless it was some illegal content that he viewed...in which case you should totally consider ratting him out.
ISP's are less worried about **** than about illegal downloads.
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.