I never heard about using oil on brushes . Even if you did, you'd still need to clean them with a shampoo to remove the residual oils .
I either use anti-bacterial dish soap or baby shampoo. Oil does work, but I wouldn't use canola oil. If you're going to use oil I'd use extra virgin olive oil.
I only use oil if I need to get waterproof makeup off of my brushes such as gel eyeliner.
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.