Alkaline battery and electric fan: what they have in common

1. Step 1. Alkaline battery — is part of — Electronic calculator. A calculator runs on a battery, sometimes on a tiny solar panel.
2. Step 2. Electronic calculator — evolved into — Microprocessor. The Intel 4004 was designed for a Busicom calculator.
3. Step 3. Microprocessor — is part of — Robot vacuum. Control.
4. Step 4. Robot vacuum — evolved from — Vacuum cleaner. An autonomous vacuum cleaner.
5. Step 5. Vacuum cleaner — has part — Impeller. An impeller creates the suction.
6. Step 6. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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