Step 1 - (sometimes the hardest part) Identify where the leak is.
Step 2 - Start pulling shingles (or tile depending on the roof) until you no longer see water damaged wood.
Step 3 - cut out all water damaged wood, replace with new wood.
Step 4 - Seal new wood - We usually used Thompson's Weather Seal.
Step 5 - replace shingles (make sure you get the singles near the top of the roof UNDER the last layer of shingles.
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.