Yes! Manhole Covers are Round because Sewers are Cylindrical! - HyperBored

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Yes! Manhole Covers are Round because Sewers are Cylindrical!

: Image via Wikipedia

I swear this was my answer the first time I heard the question: Round Manhole Covers, or: If Richard Feynman applied for a job at Microsoft :: hebig.org/blog

Q: Why are manhole covers round? A: We have to look at what is under the cover to answer that question. The hole below the cover is round because a cylinder is the strongest shape against the compression of the earth around it.

You have to read the whole article. It's great.

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Posted April 20, 2009 by Tac Anderson