EPISODE · May 10, 2026 · 2 MIN
1648: "Why Are Manhole Covers Round?"
from Interesting Things with JC · host JC
Interesting Things with JC #1648: "Why Are Manhole Covers Round?" – A heavy cover sits over a city access hole, but its shape keeps it from dropping into the tunnel below; the same circle also spreads traffic force and lets workers roll 90-to-250-pound cast iron through the street. This episode is inspired by Mr. Paul.
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1648: "Why Are Manhole Covers Round?"
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