Atom detector and shaduf: what they have in common

1. Step 1. Atom detector — is part of — Atomic clock. It records the transitions.
2. Step 2. Atomic clock — evolved from — Quartz clock. The quartz oscillator is tuned to an atomic standard.
3. Step 3. Quartz clock — has part — Tuning fork. Quartz shaped like a tuning fork at 32,768 Hz.
4. Step 4. Tuning fork — is used in — Piano. Tuning.
5. Step 5. Piano — has part — Lever. The hammer action is a system of levers.
6. Step 6. Lever — is used in — Shaduf. A shaduf is a lever with a counterweight.

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