Sterilization and turbojet engine: what they have in common

1. Step 1. Sterilization — uses — Germ theory of disease. The rationale.
2. Step 2. Germ theory of disease — uses — Culture medium (agar). Koch’s postulates.
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 — Turbojet engine. The compressor compresses the air.

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