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Re: [Phys-l] Q: Why are manhole covers round?

It is probably because you do not want the covers to accidentally fall into
the hole. A square one can be oriented so as to fall through, but a round
one can not.

This reminds me of the question "Why do gorillas have big nostrils?" The
answer is because they have big fingers.

John M. Clement
Houston, TX


A: Because the manholes are round.


(Something to keep in mind when discussing "cause and effect".)