Email and atomic clock: what they have in common

1. Step 1. Email — uses — Internet. It works over the Internet.
2. Step 2. Internet — is made of — Silica (sand). The backbones are silica optical fibre.
3. Step 3. Silica (sand) — is material for — Quartz clock. The resonator is a quartz crystal.
4. Step 4. Quartz clock — evolved into — Atomic clock. The quartz oscillator is tuned to an atomic standard.

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