General anaesthesia and petri dish: what they have in common

1. Step 1. General anaesthesia — uses — Diethyl ether. Ether anaesthesia (Morton, 1846).
2. Step 2. Diethyl ether — is made of — Ethanol. Made from ethanol.
3. Step 3. Ethanol — uses — Fermentation. Alcohol is produced by fermentation.
4. Step 4. Fermentation — is used in — Antibiotic. Penicillin is produced by fermentation.
5. Step 5. Antibiotic — uses — Petri dish. Fleming noticed mould in a Petri dish.

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