Manhole Shape

Why do we preferably have round manhole covers and not square ones?




Similar Riddles

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

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A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

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A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

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I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

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They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

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I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

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You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

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What is the difference between a jeweller and a jailer?

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Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

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I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

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Amazing Facts

Out of the Box

The phrase “thinking outside the box” was popularised from the solution to a topographical puzzle involving 9 dots in a box shape.