Cache memory and incandescent light bulb: what they have in common

1. Step 1. Cache memory — has part — Transistor. Cache cells are transistors.
2. Step 2. Transistor — is part of — Transistor radio. Transistors instead of vacuum tubes.
3. Step 3. Transistor radio — has part — Dry cell. Batteries.
4. Step 4. Dry cell — is part of — Torch (flashlight). Batteries.
5. Step 5. Torch (flashlight) — has part — Incandescent light bulb. A bulb (today an LED).

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