Blood bank and voltaic pile: what they have in common

1. Step 1. Blood bank — uses — Refrigerator. Cold storage.
2. Step 2. Refrigerator — uses — Refrigerant. A refrigerant.
3. Step 3. Refrigerant — is made of — Ammonia. Ammonia was one of the first refrigerants.
4. Step 4. Ammonia — is made of — Hydrogen. Hydrogen.
5. Step 5. Hydrogen — uses — Electrolysis. Hydrogen is produced by electrolysis of water.
6. Step 6. Electrolysis — evolved from — Voltaic pile. The first electrolysis of water was powered by a voltaic pile.

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