Stone core e electric generator: o que têm em comum

1. Passo 1. Stone core — faz parte de — Stone tool. A pebble from which flakes are struck.
2. Passo 2. Stone tool — inclui — Quern. A quern is two stones: the upper one is turned on the lower to grind grain.
3. Passo 3. Quern — tem como parte — Millstone. Grain is ground between millstones.
4. Passo 4. Millstone — faz parte de — Windmill. A windmill turns the millstones.
5. Passo 5. Windmill — evoluiu para — Wind turbine. A windmill with a generator instead of millstones.
6. Passo 6. Wind turbine — tem como parte — Electric generator. A generator.

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