Guided missile and internal combustion engine: what they have in common

1. Step 1. Guided missile — evolved from — Rocket. A rocket with guidance.
2. Step 2. Rocket — evolved into — Liquid-propellant rocket engine. Goddard switched to liquid fuel.
3. Step 3. Liquid-propellant rocket engine — uses — Hydrogen. Hydrogen is an efficient fuel.
4. Step 4. Hydrogen — is used in — Airship. Zeppelins were filled with hydrogen.
5. Step 5. Airship — has part — Internal combustion engine. Internal combustion engines.

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