This is just a start of an idea. I noticed that when hitting flint rock with a fire striker steel you get the same smell as electric trains. Therefore I wonder if the ancient flint technique could give some insight into electricity generation?
Update. I imagined the smell of electricity could have something to do with electric resistance. Then I came up with the abstract idea of a corresponding electric lubricant. So should there exist an electric lubricant as there exist for friction to minimize energy loss.