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Why are manhole covers round?
This is a test question on the Harvard entrance exam
It has lots of answers, it's just a question asked to see how you analyze a question with many different question. I go with because it's the best shape for the human body to go down, and circles have more area for the same amount material than any other shape.
Because, Nothing round falls within itself !
So the cover doesnt fall down the hole...
because its easy to roll it out..
Because the hole is round