Steam hammer and petri dish: what they have in common

1. Step 1. Steam hammer — has part — Boiler. A boiler supplies the steam.
2. Step 2. Boiler — is part of — Autoclave. A steam generator.
3. Step 3. Autoclave — is used in — Sterilization. Sterilization by steam.
4. Step 4. Sterilization — uses — Germ theory of disease. The rationale.
5. Step 5. Germ theory of disease — is used in — Petri dish. Growing bacterial cultures.

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