I joined Carol in Pittsburgh last weekend at an early education conference. As we walked three blocks back to the hotel after dinner on Monday with Sarah, Carol’s colleague at the SF State children’s center, Sarah enjoyed pointing out the disparate manhole covers we passed. It reminded me of a brain-teaser:
Why are most manhole covers round?
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So the bloody cover can’t fall into its own hole.
RectorSite 
I’m sure other older cities have a similar mix of manholes — what about SF? But it does present another illustration of why it’s called Steel City.
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