Glass of water and hammer: what they have in common

1. Step 1. Glass of water — is material for — Bread. It binds the dough.
2. Step 2. Bread — uses — Quern. Flour was ground on millstones.
3. Step 3. Quern — is a kind of — Stone tool. A quern is two stones: the upper one is turned on the lower to grind grain.
4. Step 4. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.

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