Smart grid and pneumatic tube: what they have in common

1. Step 1. Smart grid — evolved from — Electrical grid. A digital grid.
2. Step 2. Electrical grid — is used in — Data centre. Power.
3. Step 3. Data centre — has part — Air conditioner. Cooling.
4. Step 4. Air conditioner — has part — Compressor. A compressor.
5. Step 5. Compressor — is part of — Pneumatic tube. A pressure or vacuum blower.

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