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If you Google "why are manhole covers round" you get 23,500 hits. I did
not look at all of them, but the ones I looked at tend to fall into
three groups; the third of which is an extension of the second.
(1) some logical reasons why round is a good idea
(2) that an answer is not really desired, it is really an interview
question to see how the respondent thinks
(3) legends/jokes about how certain people (like Feynman) would have
responded to the question