Replace sqrt n with sqrt $ fromIntegral n. The problem is that sqrt has type (Floating a) => a -> a, so it doesn't work on integers. The function fromIntegral :: (Integral a, Num b) => a -> be "casts" from integral types to more general Num instances.
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.