Great post, another example of inspiration being all around us. Sometimes all you have to do is look around, or down :)
A popular quiz question but do you know why manhole covers are round?
You are viewing a single comment's thread from:
Great post, another example of inspiration being all around us. Sometimes all you have to do is look around, or down :)
A popular quiz question but do you know why manhole covers are round?
I didn't know but found this:
A round manhole cover cannot fall through its circular opening, whereas a square manhole cover could fall in if it were inserted diagonally in the hole. Circular covers don't need to be rotated or precisely aligned when placing them on the opening. A round manhole cover is easily moved and rolled.
Thanks for making me think!