Penicillin and heat pump: what they have in common

1. Step 1. Penicillin — uses — Fermentation. Production by fermentation.
2. Step 2. Fermentation — is used in — Sewage treatment plant. Activated sludge is microbes.
3. Step 3. Sewage treatment plant — has part — Compressor. Blowers supply oxygen to the microbes.
4. Step 4. Compressor — is part of — Heat pump. A compressor.

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