Matchlock and computer: what they have in common

1. Step 1. Matchlock — is part of — Musket. Early muskets were matchlocks.
2. Step 2. Musket — uses — Gunpowder. Gunpowder propels the bullet.
3. Step 3. Gunpowder — is used in — Rocket. The first rockets were powered by gunpowder.
4. Step 4. Rocket — evolved into — Liquid-propellant rocket engine. Goddard switched to liquid fuel.
5. Step 5. Liquid-propellant rocket engine — is part of — Lunar module. A descent engine.
6. Step 6. Lunar module — uses — Computer. The Apollo Guidance Computer.

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