Bread and pneumatic tube: what they have in common

1. Step 1. Bread — uses — Fermentation. Yeast dough rises through 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 — Pneumatic tube. A pressure or vacuum blower.

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