Glass dish bottom and air conditioner: what they have in common

1. Step 1. Glass dish bottom — is part of — Petri dish. A flat dish.
2. Step 2. Petri dish — is used in — Culture medium (agar). Agar in dishes.
3. Step 3. Culture medium (agar) — is used in — Sewage treatment plant. Waste water is cleaned by activated sludge — bacteria.
4. Step 4. Sewage treatment plant — has part — Compressor. Blowers supply oxygen to the microbes.
5. Step 5. Compressor — is part of — Air conditioner. A compressor.

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