Dishwasher and voltaic pile: what they have in common

1. Step 1. Dishwasher — has part — Centrifugal pump. A pump feeds water to the spray arms.
2. Step 2. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.
3. Step 3. Liquid-propellant rocket engine — uses — Hydrogen. Hydrogen is an efficient fuel.
4. Step 4. Hydrogen — uses — Electrolysis. Hydrogen is produced by electrolysis of water.
5. Step 5. Electrolysis — evolved from — Voltaic pile. The first electrolysis of water was powered by a voltaic pile.

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