Spectral lines and CNC machine: what they have in common

1. Step 1. Spectral lines — is used in — Atomic clock. The second is defined by the frequency of an atomic transition.
2. Step 2. Atomic clock — is used in — GPS (satellite navigation). The satellites carry atomic clocks; the position is calculated from signal arrival times.
3. Step 3. GPS (satellite navigation) — is part of — Self-driving car. Satellite navigation.
4. Step 4. Self-driving car — uses — Cruise control. Adaptive cruise control is a step towards autonomy.
5. Step 5. Cruise control — has part — Servomotor. A servo moves the throttle.
6. Step 6. Servomotor — is part of — CNC machine. Servo drives move the axes.

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