Oven mouth and needle: what they have in common

1. Step 1. Oven mouth — is part of — Oven. An opening for loading and draught.
2. Step 2. Oven — is used in — Bread. Bread is baked in an oven.
3. Step 3. Bread — uses — Quern. Flour was ground on 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 — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.

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