Bowling pinsetter and liquid-propellant rocket engine: what they have in common

1. Step 1. Bowling pinsetter — has part — Conveyor belt. Returning the balls.
2. Step 2. Conveyor belt — has part — Ball bearing. The rollers turn on bearings.
3. Step 3. Ball bearing — is part of — Washing machine. Drum bearings.
4. Step 4. Washing machine — has part — Centrifugal pump. A drain pump.
5. Step 5. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.

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