Aluminium can and petri dish: what they have in common

1. Step 1. Aluminium can — evolved from — Tin can. A tin can.
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 — is used in — Petri dish. Growing bacterial cultures.

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