Antisepsis and chisel: what they have in common

1. Step 1. Antisepsis — uses — Germ theory of disease. Lister relied on Pasteur’s work.
2. Step 2. Germ theory of disease — is used in — Vaccine. Pasteur developed vaccination on the basis of germ theory.
3. Step 3. Vaccine — uses — Syringe. Injections.
4. Step 4. Syringe — has part — Needle. A hollow needle.
5. Step 5. Needle — uses — Wedge. The point pushes the material apart like a wedge.
6. Step 6. Wedge — is used in — Chisel. The cutting edge is a wedge.

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