The cat who was at the vet smells differently. You may want to try to neutralize the scent with baking soda rubbed through your younger cat's fur and then you might try feliway around the house to calm down both cats. You might also try after the baking soda, rubbing both cats with catnip or catmint to help mask whatever smells are left.
The one cat is probably attacking the other because it smells different than normal. You may want to try to put some baby powder on both of them so they have the same scent. Hope this helps!
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.