Boat and steam turbine: what they have in common

1. Step 1. Boat — evolved into — Sailing ship. Sailing ships grew out of rowing boats.
2. Step 2. Sailing ship — has part — Compass. A magnetic compass.
3. Step 3. Compass — evolved into — Gyrocompass. A compass without a magnet.
4. Step 4. Gyrocompass — is part of — Ironclad. Steel ships distort a magnetic compass.
5. Step 5. Ironclad — evolved into — Aircraft carrier. The first aircraft carriers were converted from battleships and cruisers.
6. Step 6. Aircraft carrier — has part — Steam turbine. Turbines (powered by a reactor on nuclear carriers).

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