Handle and voltaic pile: what they have in common

1. Step 1. Handle — is part of — Plough. Handles for steering the plough.
2. Step 2. Plough — is used in — Crop rotation. The three-field system with a heavy plough.
3. Step 3. Crop rotation — evolved into — Mineral fertilizer. Fertilizers solved the problem of fertility that crop rotation used to solve.
4. Step 4. Mineral fertilizer — uses — Sulfuric acid. Superphosphate is made with sulfuric acid.
5. Step 5. Sulfuric acid — is used in — Lead–acid battery. The electrolyte.
6. Step 6. Lead–acid battery — evolved from — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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