Sleeping car and rocket: what they have in common

1. Step 1. Sleeping car — has part — Bogie. Bogies.
2. Step 2. Bogie — has part — Ball bearing. Axle boxes with roller bearings.
3. Step 3. Ball bearing — is part of — Gyroscope. Legs.
4. Step 4. Gyroscope — is part of — Guided missile. An inertial system.
5. Step 5. Guided missile — evolved from — Rocket. A rocket with guidance.

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