Rocket service tower gantry and voltaic pile: what they have in common

1. Step 1. Rocket service tower gantry — is part of — Launch complex. Towers for access to the rocket.
2. Step 2. Launch complex — uses — Rocket. Launching rockets.
3. Step 3. Rocket — evolved into — Liquid-propellant rocket engine. Goddard switched to liquid fuel.
4. Step 4. Liquid-propellant rocket engine — uses — Hydrogen. Hydrogen is an efficient fuel.
5. Step 5. Hydrogen — uses — Electrolysis. Hydrogen is produced by electrolysis of water.
6. Step 6. Electrolysis — evolved from — Voltaic pile. The first electrolysis of water was powered by a voltaic pile.

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