Compasses and syringe: what they have in common

1. Step 1. Compasses — has part — Pivot joint. The pivot of the opening.
2. Step 2. Pivot joint — is part of — Scissors. A screw axle.
3. Step 3. Scissors — uses — Wedge. The blades cut like wedges.
4. Step 4. Wedge — is used in — Needle. The point pushes the material apart like a wedge.
5. Step 5. Needle — is part of — Syringe. A hollow needle.

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