I don’t even know how a slide rule fucking works. By the time I started my engineering career, only the old farts knew how to use them. I wasn’t yet an old fart. Note that I said knew how to use them and not used them. Electronic calculators took over completely. The elegance that was the slide rule never had a chance. My father thought they were elegant and I guess they were. He knew how to use one. He also used one. He tried to teach Bill, who fought it tooth and nail, but he never showed me.