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xkcd #2888: US Survey Foot
(imgs.xkcd.com)
Alt text:
Subway refuses to answer my questions about whether it's an International Footlong or a US Survey Footlong. A milligram of sandwich is at stake!
Also, the NIST goon squad there is only 84.48 feet off from the perp's location...
But which foot?!!
As long as the person fleeing is the one using the survey feet, the pursuers will never actually reach them.
Ah yes. Zeno's left foot.