Wind power and plough: what they have in common

1. Step 1. Wind power — is used in — Windmill. The prime mover is the wind.
2. Step 2. Windmill — has part — Millstone. A windmill turns the millstones.
3. Step 3. Millstone — is part of — Quern. Grain is ground between millstones.
4. Step 4. Quern — is a kind of — Stone tool. A quern is two stones: the upper one is turned on the lower to grind grain.
5. Step 5. Stone tool — evolved into — Hoe. Neolithic hoes of stone and antler.
6. Step 6. Hoe — evolved into — Plough. The plough mechanized loosening the soil with a hoe.

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