Antibodies and electric fan: what they have in common

1. Step 1. Antibodies — uses — Germ theory of disease. Immunity against microbes.
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 — has part — Impeller. A centrifugal compressor is an impeller.
6. Step 6. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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