How much is that in nanoseconds per inch?

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Or fathoms per hogshead, as in this Language Log posting from last month. Here's Zippy's take:

[Addendum: Richard Pérez writes to say that Zippy's "eighteenth of an inch" answer is way off, at least if if you understand the length of a nanosecond to be the distance light travels in a nanosecond (which is close to 30 centimeters, or between 11 and 12 inches). Grace Hopper (of computer fame) used to illustrate this fact in her public lectures with lengths of wire of the appropriate size — a demonstration that Pérez remembers from his high school days.]

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