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To be honest, love the “Ferrous Wheel” pun. It’s too good.
Can you explain it? I don't get it.
Ferrous means iron. When they say Ferrous wheel, it means how the iron is stored and used in the biosphere and lithosphere. It is a pun on Ferris Wheel, which is an amusement park ride.
Google Ferris wheel. The London Eye is an example of a Ferris wheel.
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