Yearlings do not generally require anything beyond good grass and / or hay and maybe a ration balancer or vitamin and mineral supplement. Just about any type of treat can be given every so often so long as it is not toxic to horses.
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.