Kick scooter and electrical telegraph: what they have in common

1. Step 1. Kick scooter — evolved into — Electric scooter. A kick scooter with a motor.
2. Step 2. Electric scooter — has part — Hub motor. A motor in the wheel.
3. Step 3. Hub motor — uses — Electromagnetism. A hub motor is an electric motor.
4. Step 4. Electromagnetism — is used in — Electrical telegraph. A telegraph receiver is an electromagnet that attracts an armature.

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