World Wide Web and refrigerator: what they have in common

1. Step 1. World Wide Web — is used in — Search engine. It indexes the web.
2. Step 2. Search engine — uses — Data centre. It runs in data centres.
3. Step 3. Data centre — has part — Air conditioner. Cooling.
4. Step 4. Air conditioner — uses — Heat pump. An air conditioner is a heat pump that carries heat out of the room.
5. Step 5. Heat pump — works like — Refrigerator. A heat pump is a refrigerator that heats the house.

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