Harpsichord and incandescent light bulb: what they have in common

1. Step 1. Harpsichord — has part — Keyboard. A keyboard.
2. Step 2. Keyboard — is part of — Personal computer. A keyboard.
3. Step 3. Personal computer — has part — CPU cooler. A cooler.
4. Step 4. CPU cooler — has part — Heat sink. A heat sink.
5. Step 5. Heat sink — is part of — LED lamp. LEDs get warm, so the lamp has an aluminium heat sink.
6. Step 6. LED lamp — evolved from — Incandescent light bulb. It replaced incandescent bulbs.

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