Charlie's micrometer joke reminded me of a college professor (slightly crazy) who used to swear that he could reliably measure to within 1/64 of an inch with a scale divided into 1/4-inch or 1/8-inch increments. He tended to get cranky when we use "undergraduate" uncertainty analysis (we were undergrads) since it demonstrated how horribly inaccurate his lab experiments were.

This was also the guy who claimed that he could draw a perfect line or circle free-hand. For some reason he never demonstrated that skill for us...

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