Yes they do, unless your an A cup but gravity does have an effect on them, and if they aren't held up properly they can cause major back strain.
It actually improves their health. They were designed to move to stimulate blood flow and the natural support system needs movement to keep up its strength. Bras keep the breast temperature higher than its design level and increase sag rates due to lack of exercise.
Note that breast cancer rates are higher in countries where bra wearing rates are higher.
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.