Antisepsis and stone tool: 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 — evolved from — Stone tool. Bone needles with an eye are part of the Palaeolithic toolkit.

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