Why use id when we can just use NSObject?

Id erases the type and it is equivalent to saying "this object responds to any selector visible to the translation". Of course, it is your responsibility to make sure your program is correct when you erase types (and also when you typecast them).

That is an incorrect statement. You can create objects that do not inherit from NSObject. It's not really recommended, but it is possible.

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.