Labels that are on this DYK:
mathematiques(19)
With a translation of Lauriie_,
mansuetus informs you that...
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.
Amazing - So what ?
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