Microprocessor and incandescent light bulb: what they have in common

1. Step 1. Microprocessor — evolved from — Electronic calculator. The Intel 4004 was designed for a Busicom calculator.
2. Step 2. Electronic calculator — has part — Alkaline battery. A calculator runs on a battery, sometimes on a tiny solar panel.
3. Step 3. Alkaline battery — evolved from — Dry cell. An improved zinc–manganese cell.
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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