Bike sharing and dewar flask: what they have in common

1. Step 1. Bike sharing — uses — Electric bicycle. Electric bicycles.
2. Step 2. Electric bicycle — has part — Hub motor. A hub motor or a mid-drive motor.
3. Step 3. Hub motor — uses — Electromagnetism. A hub motor is an electric motor.
4. Step 4. Electromagnetism — is used in — Cathode-ray tube. The beam is deflected by a magnetic field.
5. Step 5. Cathode-ray tube — uses — Vacuum. Inside is a vacuum.
6. Step 6. Vacuum — is used in — Dewar flask. A vacuum.

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