You are likely firing so many "keyup" events that when you type fast or enter multiple characters at a time the events are not necessarily finishing the the order they were fired, and you end up with a sum that is a couple characters old.
Try keypress, it works : http://jsfiddle.net/RnTHJ/4.
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.