On your Mac, open up disk utility. It's an application already on your computer. The quickest way to find it would be to search in spotlight.
Once open, find the drive on the left hand side. Click on it, and click repair disk. This should fix it.
Any options along the line of "format" will erase the disk, and probably fix it.
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.