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An other one!

April 23, 2010 - With a translation of Lauriie_, mansuetus informs you that...
mathematiques

Manholes

Manhole covers are round so that they cannot fall in the opening.


Details:

The hole in the middle is for opening them with a metallic bar.
Some other covers are square (like the ones for underground phone cables) and could fall.

Source:

Wikipedia – Manhole

Spincredible! - Spitiful.


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