Paper tissues and turbine: what they have in common

1. Step 1. Paper tissues — is made of — Wood pulp. Cellulose.
2. Step 2. Wood pulp — is material for — Jigsaw puzzle. Cardboard.
3. Step 3. Jigsaw puzzle — uses — Saw. Cut out with a fretsaw.
4. Step 4. Saw — is used in — Sawmill. The cutting tool is a saw.
5. Step 5. Sawmill — has part — Water wheel. Early sawmills were driven by water wheels.
6. Step 6. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.

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