Surfboard stringer and knife: what they have in common

1. Step 1. Surfboard stringer — is part of — Surfboard. A longitudinal stiffening batten.
2. Step 2. Surfboard — uses — Archimedes’ principle. Buoyancy.
3. Step 3. Archimedes’ principle — is used in — Boat. A vessel stays afloat by Archimedes’ principle.
4. Step 4. Boat — has part — Oar. A boat was moved by oars.
5. Step 5. Oar — has part — Handle. A beater for hand washing.
6. Step 6. Handle — is part of — Knife. A handle.

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