It's possible for multiple houses (e.g. in different cities) to have the same street name and number. What's the closest pair of such "twins" in the UK?
I truly appreciate the dedication that went into researching this bit of trivia.
Why POSIX filesystem semantics aren't a good fit for large scale systems. (The funny thing is that it never occurred to me that anyone would use POSIX APIs in a modern distributed context. But apparently in supercomputing they do).