Aqueduct and fuel cell: what they have in common

1. Step 1. Aqueduct — works like — Plumbing. An aqueduct brings water to a city, plumbing distributes it inside; Minoan pipes are older than the Roman aqueducts.
2. Step 2. Plumbing — has part — Water tower. Maintaining pressure.
3. Step 3. Water tower — has part — Centrifugal pump. Filled by pumps.
4. Step 4. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.
5. Step 5. Liquid-propellant rocket engine — uses — Hydrogen. Hydrogen is an efficient fuel.
6. Step 6. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.

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