Smelting and joystick: what they have in common

1. Step 1. Smelting — uses — Combustion. Charcoal provides heat and reduces the metal from the ore.
2. Step 2. Combustion — is used in — Afterburner. Reheat.
3. Step 3. Afterburner — is part of — Jet fighter. An afterburner.
4. Step 4. Jet fighter — uses — Fly-by-wire. Fly-by-wire.
5. Step 5. Fly-by-wire — uses — Joystick. A sidestick controller.

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