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The correct question, obviously, would be "why in some places they make manhole covers round and which advantages and disadvantages over square ones they have?"

by smsm42 8y ago

The correct question, obviously, would be "why in some places they make manhole covers round and which advantages and disadvantages over square ones they have?" Which, as any good question does, already contains part of the answer.

watwut 8y ago
It could be coupled with following question: "why in some places they make manhole covers square and which advantages and disadvantages over round ones they have?"
- smsm42 8y ago
  That is, essentially, the same question :) Except, of course, for triangular ones, which also exist.