Hard disk drive and atomic clock: what they have in common

1. Step 1. Hard disk drive — has part — Neodymium magnet. The head actuator.
2. Step 2. Neodymium magnet — is part of — Electric car. Synchronous traction motors use neodymium magnets.
3. Step 3. Electric car — evolved into — Self-driving car. Most self-driving cars are built on electric platforms.
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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