Atomic clock and railway track: what they have in common

1. Step 1. Atomic clock — has part — Oscillator. A quartz oscillator is tuned to the atoms.
2. Step 2. Oscillator — has part — Capacitor. An LC circuit.
3. Step 3. Capacitor — is made of — Tin. The plates are made of tin foil.
4. Step 4. Tin — is material for — Model railway. The first models were tinplate.
5. Step 5. Model railway — uses — Railway track. It runs on rails.

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