Bones build density only where loads are applied. Thus, jogging might increase bone mass density (BMD) in the legs and, perhaps to a lesser extent, in the lower spine. But jogging won't do much for the upper spine or arms.
An effective exercise program to prevent osteoporosis should systematically work the entire body.
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.