Server and petri dish: what they have in common

1. Step 1. Server — is part of — Data centre. Thousands of servers.
2. Step 2. Data centre — has part — Air conditioner. Cooling.
3. Step 3. Air conditioner — has part — Compressor. A compressor.
4. Step 4. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.
5. Step 5. Sewage treatment plant — uses — Culture medium (agar). Waste water is cleaned by activated sludge — bacteria.
6. Step 6. Culture medium (agar) — uses — Petri dish. Agar in dishes.

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