Roller skates and steam turbine: what they have in common

1. Step 1. Roller skates — has part — Ball bearing. Bearings.
2. Step 2. Ball bearing — is part of — Electric generator. Shaft bearings.
3. Step 3. Electric generator — is part of — Geothermal power station. The turbine turns the generator.
4. Step 4. Geothermal power station — has part — Steam turbine. Steam from underground turns the turbines.

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