Streaming and davy lamp: what they have in common

1. Step 1. Streaming — uses — Data centre. Servers.
2. Step 2. Data centre — uses — Electrical grid. Power.
3. Step 3. Electrical grid — has part — Power station. Power stations feed the grid.
4. Step 4. Power station — uses — Coal. The first stations ran on coal.
5. Step 5. Coal — uses — Coal mine. Extraction.
6. Step 6. Coal mine — uses — Davy lamp. Protection against methane explosions.

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