Pot lid and atomic clock: what they have in common

1. Step 1. Pot lid — is part of — Kettle. A cap.
2. Step 2. Kettle — includes — Whistling kettle. A kettle.
3. Step 3. Whistling kettle — has part — Whistle. A whistle.
4. Step 4. Whistle — uses — Resonance. Resonance of the chamber.
5. Step 5. Resonance — is used in — Quartz clock. Resonance of the crystal.
6. Step 6. Quartz clock — evolved into — Atomic clock. The quartz oscillator is tuned to an atomic standard.

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