Fresnel lens and steam turbine: what they have in common

1. Step 1. Fresnel lens — is part of — Lighthouse. A stepped lens gathers the light into a beam.
2. Step 2. Lighthouse — uses — Combustion. Ancient lighthouses shone with fire.
3. Step 3. Combustion — is used in — Boiler. The firebox heats the water.
4. Step 4. Boiler — is part of — Steam turbine. Steam from the boiler.

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