Set saw teeth and steam turbine: what they have in common

1. Step 1. Set saw teeth — is part of — Saw. The set of the teeth widens the kerf so the saw does not bind.
2. Step 2. Saw — is used in — Sawmill. The cutting tool is a saw.
3. Step 3. Sawmill — has part — Water wheel. Early sawmills were driven by water wheels.
4. Step 4. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
5. Step 5. Turbine — includes — Steam turbine. A kind of turbine.

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