General anaesthesia and sonar: 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 — is material for — Biofuel. Bioethanol.
4. Step 4. Biofuel — is used in — Diesel engine. A diesel also runs on vegetable oil.
5. Step 5. Diesel engine — is part of — Submarine. Diesel-electric submarines.
6. Step 6. Submarine — has part — Sonar. Underwater acoustics.

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