Corkscrew and needle: what they have in common

1. Step 1. Corkscrew — has part — Hook spur. A rest on the bottle neck for the lever.
2. Step 2. Hook spur — is part of — Spear-thrower. A hook against which the dart rests.
3. Step 3. Spear-thrower — uses — Spear. It throws darts.
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.

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