Why do balloons fly at low altitudes?

Thy are held up by gas that is lighter than air. The hgher you go, the less dense air gets and therefore the less the difference between the gas being used to hold the balloon aloft and the air outside They can therefore only go so high Also, most balloons are not pressurised therefore the people fying in them would pass out for lack of oxygen if they went much above 10,000feet.

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.