Hypertext and sewage treatment plant: what they have in common

1. Step 1. Hypertext — is used in — World Wide Web. The web is hypertext.
2. Step 2. World Wide Web — is used in — Search engine. It indexes the web.
3. Step 3. Search engine — uses — Data centre. It runs in data centres.
4. Step 4. Data centre — has part — Air conditioner. Cooling.
5. Step 5. Air conditioner — has part — Compressor. A compressor.
6. Step 6. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

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