Three Sides to Every Story


Triangular manhole covers in Nashua, NH. How unusual.

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Staff photo by Don himsel
Manhole covers in Nashua are unique for their triangular shape. The shape never caught on in other cities. Most covers are circles, because they can’t possibly fall through their own hole onto a worker….

Fascinating!

Those brainteasers often say that a circle is the only shape that can’t fall through its own hole, but that’s not true.

In fact, any polygon with an odd number of sides would work…

It must be winter around here, what with all the posts having nothing to do with cactus.


    
    
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