Smart grid and shipping container: what they have in common

1. Step 1. Smart grid — evolved from — Electrical grid. A digital grid.
2. Step 2. Electrical grid — has part — Transformer. Transformer substations.
3. Step 3. Transformer — is part of — Defibrillator. Stepping up the voltage.
4. Step 4. Defibrillator — is part of — Ambulance. A defibrillator.
5. Step 5. Ambulance — evolved from — Truck. A special-purpose vehicle.
6. Step 6. Truck — uses — Shipping container. A container moves from ship to truck without being unloaded.

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