Ruler and data centre: what they have in common

1. Step 1. Ruler — has part — Measurement scale. Marked graduations.
2. Step 2. Measurement scale — is part of — Barometer. Millimetres of mercury.
3. Step 3. Barometer — uses — Vacuum. The Torricellian vacuum above the mercury.
4. Step 4. Vacuum — is used in — Cyclotron. Particles fly in a vacuum.
5. Step 5. Cyclotron — evolved into — Large Hadron Collider. Ring accelerators.
6. Step 6. Large Hadron Collider — uses — Data centre. A grid for processing data.

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