Water tower and rocket: what they have in common

1. Step 1. Water tower — has part — Centrifugal pump. Filled by pumps.
2. Step 2. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.
3. Step 3. Liquid-propellant rocket engine — evolved from — Rocket. Goddard switched to liquid fuel.

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