Lathe and syringe: what they have in common

1. Step 1. Lathe — has part — Rope. The bowstring wraps around the workpiece and turns it.
2. Step 2. Rope — is part of — Harpoon. A line connects the head to the hunter.
3. Step 3. Harpoon — evolved from — Spear. A spear with barbs.
4. Step 4. Spear — has part — Stone tool. Early spearheads were made of stone.
5. Step 5. Stone tool — evolved into — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.
6. Step 6. Needle — is part of — Syringe. A hollow needle.

Open Evothings