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I still have a HP48GX in perfect condition and love it. One of my first programs was to calculate how much „slower“ my time is running when I drive a car or fly in a plane compared to someone standing still on the sidewalk.

I still find it much more comfortable having a real calculator… call me old fashioned.

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A physicist working on the project used this to compute the space contraction for the https://en.wikipedia.org/wiki/Oh-My-God_particle, which presumably traveled at 0.9999999999999999999999951 time the speed of light. You cannot do that with your HP48GX directly using standard formulas, because it only has 12 digits of precision.

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