Flour sieve and electric generator: what they have in common

1. Step 1. Flour sieve — is part of — Gristmill. It separates flour from bran.
2. Step 2. Gristmill — has part — Millstone. Grain is ground by millstones.
3. Step 3. Millstone — is part of — Windmill. A windmill turns the millstones.
4. Step 4. Windmill — evolved into — Wind turbine. A windmill with a generator instead of millstones.
5. Step 5. Wind turbine — has part — Electric generator. A generator.

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