NSPlaceholderMutableString is the class used in allocating new instances of NSMutableString. Check where you're creating these objects (charge the Foundation libraries to its callers in the data mining inspector) and you'll find where to audit your code. Beware that the Leaks tool is not 100% successful so there is some chance that you're seeing a false +ve, but it's still definitely worth checking out.
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.