Shaft and atomic clock: what they have in common

1. Step 1. Shaft — is part of — Universal joint. Connects two shafts.
2. Step 2. Universal joint — is part of — Car. A universal joint carries rotation to the rear axle.
3. Step 3. Car — includes — Self-driving car. A self-driving car is an ordinary car driven by a computer with cameras and sensors.
4. Step 4. Self-driving car — has part — GPS (satellite navigation). Satellite navigation.
5. Step 5. GPS (satellite navigation) — uses — Atomic clock. The satellites carry atomic clocks; the position is calculated from signal arrival times.

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