Ski lift and knife: what they have in common

1. Step 1. Ski lift — works like — Cable car. Cable transport.
2. Step 2. Cable car — uses — Rope. A steel rope pulls and holds a cable car's cabins.
3. Step 3. Rope — is part of — Harpoon. A line connects the head to the hunter.
4. Step 4. Harpoon — evolved from — Spear. A spear with barbs.
5. Step 5. Spear — has part — Stone tool. Early spearheads were made of stone.
6. Step 6. Stone tool — evolved into — Knife. The first knives were stone flakes.

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