Can body and sewage treatment plant: what they have in common

1. Step 1. Can body — is part of — Tin can. A tin cylinder.
2. Step 2. Tin can — is used in — Canning. Canned food in tins.
3. Step 3. Canning — uses — Pasteurization. Sterilization by heat.
4. Step 4. Pasteurization — uses — Germ theory of disease. Killing microbes with heat.
5. Step 5. Germ theory of disease — uses — Culture medium (agar). Koch’s postulates.
6. Step 6. Culture medium (agar) — is used in — Sewage treatment plant. Waste water is cleaned by activated sludge — bacteria.

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