Jigsaw puzzle pieces and steam turbine: what they have in common

1. Step 1. Jigsaw puzzle pieces — is part of — Jigsaw puzzle. Cardboard pieces with tabs and slots.
2. Step 2. Jigsaw puzzle — uses — Saw. Cut out with a fretsaw.
3. Step 3. Saw — is used in — Sawmill. The cutting tool is a saw.
4. Step 4. Sawmill — has part — Water wheel. Early sawmills were driven by water wheels.
5. Step 5. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
6. Step 6. Turbine — includes — Steam turbine. A kind of turbine.

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