Helpful hints for Converting to Metric at XKCD
Other unit and conversion help
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Helpful hints for Converting to Metric at XKCD
Other unit and conversion help
As has been said, miles and klicks are a Fibonacci sequence near enough.
1,1,2,3,5,8,13,21,34… Given one number in miles, the next is that distance in kilometers. The interested reader is invited to adapt that to penis vs. Bic pen length re XKCD. More studies are needed.