Gristmill and needle: what they have in common

1. Step 1. Gristmill — evolved from — Quern. The mill mechanized hand-turned millstones.
2. Step 2. Quern — is a kind of — Stone tool. A quern is two stones: the upper one is turned on the lower to grind grain.
3. Step 3. Stone tool — evolved into — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.

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