Helium filled latex balloons have a floating time of approximately 12-18 hours. Since helium particles are much smaller than air particles, the helium gas escapes through the latex material much quicker than air. However, floating time can be extended to 1-4 weeks, on average, by treating the balloons with a special compound called Ultra more.
Standard size latex balloons (12") will float for 8-12 hours, However; there is a treatment called Hi-Float which seals the pores of the balloon to make them last 4-5 days. Mylar (foil) balloons float for a minimum of 1 week, and can be re-inflated over and over again. More.
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.