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Working in HFT, my favorite is 1 nanosecond ≈ 1 foot



grace hopper would carry around nanosecond-long wires, for demonstrations

https://youtu.be/ZR0ujwlvbkQ?si=aAj2OkbS8cj_MeGo&t=2707


My favorite from What if? (xkcd):

20 miles per gallon ≈ 0.1 mm²

https://www.wolframalpha.com/input/?i=1%2F%2820+mile%2Fgallo...




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