Fountain pen and archimedes’ screw: what they have in common

1. Step 1. Fountain pen — is made of — Stainless steel. The nib of a modern fountain pen is stainless steel.
2. Step 2. Stainless steel — is material for — Cutlery. Stainless steel.
3. Step 3. Cutlery — has part — Knife. Knives.
4. Step 4. Knife — is part of — Meat grinder. A cross-shaped blade.
5. Step 5. Meat grinder — has part — Auger. An auger.
6. Step 6. Auger — evolved from — Archimedes’ screw. The Archimedes’ screw as a conveyor.

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