Fresnel lens and computer: what they have in common

1. Step 1. Fresnel lens — is part of — Lighthouse. A stepped lens gathers the light into a beam.
2. Step 2. Lighthouse — uses — Combustion. Ancient lighthouses shone with fire.
3. Step 3. Combustion — is used in — Afterburner. Reheat.
4. Step 4. Afterburner — is part of — Jet fighter. An afterburner.
5. Step 5. Jet fighter — uses — Fly-by-wire. Fly-by-wire.
6. Step 6. Fly-by-wire — uses — Computer. On-board computers.

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