Sawmill and multistage rocket: what they have in common

1. Step 1. Sawmill — has part — Water wheel. Early sawmills were driven by water wheels.
2. Step 2. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
3. Step 3. Turbine — is part of — Turbojet engine. The turbine drives the compressor.
4. Step 4. Turbojet engine — uses — Kerosene. Jet fuel is kerosene.
5. Step 5. Kerosene — is material for — Multistage rocket. The fuel is kerosene.

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