Screw lamp base and personal computer: what they have in common

1. Step 1. Screw lamp base — is part of — Incandescent light bulb. A screw contact (the Edison base).
2. Step 2. Incandescent light bulb — evolved into — LED lamp. It replaced incandescent bulbs.
3. Step 3. LED lamp — has part — Heat sink. LEDs get warm, so the lamp has an aluminium heat sink.
4. Step 4. Heat sink — is part of — CPU cooler. A heat sink.
5. Step 5. CPU cooler — is part of — Personal computer. A cooler.

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