Orrery and transformer: what they have in common

1. Step 1. Orrery — evolved into — Planetarium. Models of the sky.
2. Step 2. Planetarium — is made of — Concrete. Zeiss’s first dome was thin concrete.
3. Step 3. Concrete — is material for — Nuclear power plant. The containment is concrete.
4. Step 4. Nuclear power plant — has part — Transformer. Transformers step up the voltage so the plant's power can travel far.

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