Stack of conical discs and internet: what they have in common

1. Step 1. Stack of conical discs — is part of — Cream separator. A stack of conical discs speeds up separation.
2. Step 2. Cream separator — has part — Gear. A gear train spins up the bowl.
3. Step 3. Gear — is part of — Pendulum clock. A wheel train.
4. Step 4. Pendulum clock — evolved into — Quartz clock. Quartz replaced the pendulum as the frequency standard.
5. Step 5. Quartz clock — is made of — Silica (sand). The resonator is a quartz crystal.
6. Step 6. Silica (sand) — is material for — Internet. The backbones are silica optical fibre.

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