Smartphone and electrical grid: what they have in common

1. Step 1. Smartphone — has part — Printed circuit board. The main board.
2. Step 2. Printed circuit board — has part — Copper wire. Copper traces.
3. Step 3. Copper wire — is part of — Power line. Wires (often aluminium).
4. Step 4. Power line — is part of — Electrical grid. Power lines.

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