Concrete and atomic clock: what they have in common

1. Step 1. Concrete — is material for — Tuned mass damper. Or concrete.
2. Step 2. Tuned mass damper — uses — Pendulum. A pendulum.
3. Step 3. Pendulum — is part of — Pendulum clock. The pendulum sets the period.
4. Step 4. Pendulum clock — evolved into — Quartz clock. Quartz replaced the pendulum as the frequency standard.
5. Step 5. Quartz clock — evolved into — Atomic clock. The quartz oscillator is tuned to an atomic standard.

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