Blue LED and typewriter: what they have in common

1. Step 1. Blue LED — is part of — LED lamp. White light comes from a blue chip and a phosphor.
2. Step 2. LED lamp — has part — Heat sink. LEDs get warm, so the lamp has an aluminium heat sink.
3. Step 3. Heat sink — is part of — CPU cooler. A heat sink.
4. Step 4. CPU cooler — is part of — Personal computer. A cooler.
5. Step 5. Personal computer — has part — Keyboard. A keyboard.
6. Step 6. Keyboard — is part of — Typewriter. The keys drive levers with type.

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