Webcam and electric generator: what they have in common

1. Step 1. Webcam — is part of — Laptop. Above the screen is a small webcam for video calls.
2. Step 2. Laptop — has part — Solid-state drive. A drive.
3. Step 3. Solid-state drive — evolved from — Hard disk drive. A replacement for the hard disk.
4. Step 4. Hard disk drive — has part — Neodymium magnet. The head actuator.
5. Step 5. Neodymium magnet — is part of — Wind turbine. Direct-drive generators.
6. Step 6. Wind turbine — has part — Electric generator. A generator.

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