Screw and multistage rocket: what they have in common

1. Step 1. Screw — evolved from — Inclined plane. A screw is an inclined plane wrapped around a cylinder.
2. Step 2. Inclined plane — is used in — Ladder. Climbing to a height.
3. Step 3. Ladder — is part of — Fire truck. An extending ladder.
4. Step 4. Fire truck — has part — Centrifugal pump. A fire pump.
5. Step 5. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.
6. Step 6. Liquid-propellant rocket engine — is part of — Multistage rocket. Engines on every stage.

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