Sling and smart meter: what they have in common

1. Step 1. Sling — is made of — Plant fibre. A sling was woven from fibres or wool.
2. Step 2. Plant fibre — is material for — Toothbrush. The bristles were hog hair, later nylon.
3. Step 3. Toothbrush — evolved into — Electric toothbrush. A motorized toothbrush.
4. Step 4. Electric toothbrush — uses — Electromagnetic induction. Wireless charging by induction.
5. Step 5. Electromagnetic induction — is used in — Electricity meter. An induction meter has a rotating disc.
6. Step 6. Electricity meter — evolved into — Smart meter. A digital meter.

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