Kodak camera and rocket: what they have in common

1. Step 1. Kodak camera — is a kind of — Camera. A camera.
2. Step 2. Camera — has part — Exposure meter. A built-in light meter.
3. Step 3. Exposure meter — has part — Photodiode. A photocell.
4. Step 4. Photodiode — is part of — Infrared seeker. A photodetector.
5. Step 5. Infrared seeker — is part of — Guided missile. A seeker.
6. Step 6. Guided missile — evolved from — Rocket. A rocket with guidance.

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