I3 2120 has hyperthreading, although it has two cores, it'll run as if it had four. The i3 is definitely better.
Core i3 is more advanced.It comes modern features like turbo boost or wireless display. And they are very new compared to pentium four. And their price is also higher than pentium four.So,if you want to spend more then go with core i3.
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.