Cheese press and hammer: what they have in common

1. Step 1. Cheese press — uses — Screw. A screw press.
2. Step 2. Screw — is used in — Auger. An auger is a screw.
3. Step 3. Auger — is part of — Meat grinder. An auger.
4. Step 4. Meat grinder — has part — Knife. A cross-shaped blade.
5. Step 5. Knife — evolved from — Stone tool. The first knives were stone flakes.
6. Step 6. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.

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