Because cows aren't machines. Their stomachs don't act as some robotic machine that produces pellets, it's living tissue that uses water and microbes and other organic compounds to digest feed, and regurgitate it up as cud to be rechewed and swallowed again.
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.