Electric fan and computer: what they have in common

1. Step 1. Electric fan — has part — Impeller. A fan's blades are an impeller that pushes the air.
2. Step 2. Impeller — is part of — Centrifugal pump. The impeller accelerates the liquid.
3. Step 3. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.
4. Step 4. Liquid-propellant rocket engine — is part of — Lunar module. A descent engine.
5. Step 5. Lunar module — uses — Computer. The Apollo Guidance Computer.

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