Bell clapper hammer and sewage treatment plant: what they have in common

1. Step 1. Bell clapper hammer — is part of — School bell. It strikes the gong.
2. Step 2. School bell — has part — Electromagnet. An electromagnet strikes the hammer.
3. Step 3. Electromagnet — includes — Superconducting magnet. An electromagnet.
4. Step 4. Superconducting magnet — is part of — Maglev. Japan’s SCMaglev uses superconducting magnets.
5. Step 5. Maglev — is made of — Concrete. The guideway is concrete.
6. Step 6. Concrete — is material for — Sewage treatment plant. The tanks are concrete.

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