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I've kept my old slide rule from high school physics.

But not out of any sentimentality. I took physics in 1978, when handheld scientific calculators were widely available. But my teacher was old-fashioned, and he insisted we used sliderules. He was also old-fashioned in giving me "Bs" for perfect papers, and indeed a B- for my final paper on fractals (which I'm sure had no idea about).

I went on to do much better in Harvard physics courses. And so my slide rule I retain, as the last vestige of a time that I, as a woman, am less nostalgic about than some others. Oh, and I definitely know how to use it, LOL! About *half* of that physics course ended up being using your slide rule well. We even used it for the calculation to make our first homemade cameras -- obviously a sensitive calculation. If you didn't "slide" well, your picture would be fuzzy.