Electricity meter and saw: what they have in common

1. Step 1. Electricity meter — uses — Electromagnetic induction. An induction meter has a rotating disc.
2. Step 2. Electromagnetic induction — is used in — Electric toothbrush. Wireless charging by induction.
3. Step 3. Electric toothbrush — evolved from — Toothbrush. A motorized toothbrush.
4. Step 4. Toothbrush — has part — Handle. A plastic handle.
5. Step 5. Handle — is part of — Saw. A handle.

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