Cesium oven and internet: what they have in common

1. Step 1. Cesium oven — is part of — Atomic clock. A source of the atomic beam.
2. Step 2. Atomic clock — evolved from — Quartz clock. The quartz oscillator is tuned to an atomic standard.
3. Step 3. Quartz clock — is made of — Silica (sand). The resonator is a quartz crystal.
4. Step 4. Silica (sand) — is material for — Internet. The backbones are silica optical fibre.

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