Overlocker and lathe: what they have in common

1. Step 1. Overlocker — has part — Knife. A knife for trimming the edge.
2. Step 2. Knife — evolved from — Stone tool. The first knives were stone flakes.
3. Step 3. Stone tool — is part of — Spear. Early spearheads were made of stone.
4. Step 4. Spear — evolved into — Harpoon. A spear with barbs.
5. Step 5. Harpoon — has part — Rope. A line connects the head to the hunter.
6. Step 6. Rope — is part of — Lathe. The bowstring wraps around the workpiece and turns it.

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