Casting and internet: what they have in common

1. Step 1. Casting — is used in — Bell. Casting.
2. Step 2. Bell — uses — Resonance. The sound.
3. Step 3. Resonance — is used in — Quartz clock. Resonance of the crystal.
4. Step 4. Quartz clock — is made of — Silica (sand). The resonator is a quartz crystal.
5. Step 5. Silica (sand) — is material for — Internet. The backbones are silica optical fibre.

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