Re: Why are ManHole Covers Round?

On Jan 30, 4:11�pm, gcook...@xxxxxxx wrote:
because a circle is the only shape that can't fall in and crush the
head.

let's talk about multi-psychic fusion later!

Marilyn Vos Savant thinks they don't fall into
the hole because there's a lip, i.e., the cover
diameter is slightly larger than the hole diameter.

ObPuzzle: how big a lip does a square cover have to
have to keep it from falling into a square hole?
.

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