Surgical suture and petri dish: what they have in common

1. Step 1. Surgical suture — uses — Needle. A surgical needle.
2. Step 2. Needle — is part of — Syringe. A hollow needle.
3. Step 3. Syringe — is used in — Vaccine. Injections.
4. Step 4. Vaccine — uses — Germ theory of disease. Pasteur developed vaccination on the basis of germ theory.
5. Step 5. Germ theory of disease — is used in — Petri dish. Growing bacterial cultures.

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