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

[<carmelo@pacific.net.sg>]

The previous answers may not be authoritative... Manhole are still available as square one...
http://www.fuzing.com/vli/0001052ea296/square_manhole_cover

> > 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