Domestication and electrical grid: what they have in common

1. Step 1. Domestication — uses — Sickle. Harvesting wild cereals with sickles.
2. Step 2. Sickle — has part — Handle. A short one-handed handle.
3. Step 3. Handle — is part of — Trowel. A handle on a curved neck.
4. Step 4. Trowel — is used in — Brick. Bricklaying with a trowel.
5. Step 5. Brick — is material for — Power station. The buildings of the first power stations were brick.
6. Step 6. Power station — is part of — Electrical grid. Power stations feed the grid.

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