Baseball bat and greenhouse: what they have in common

1. Step 1. Baseball bat — has part — Handle. A thin handle.
2. Step 2. Handle — is part of — Plough. Handles for steering the plough.
3. Step 3. Plough — is used in — Crop rotation. The three-field system with a heavy plough.
4. Step 4. Crop rotation — evolved into — Mineral fertilizer. Fertilizers solved the problem of fertility that crop rotation used to solve.
5. Step 5. Mineral fertilizer — is used in — Hydroponics. A nutrient solution.
6. Step 6. Hydroponics — uses — Greenhouse. Usually in greenhouses.

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