Bayonet socket and archimedes’ screw: what they have in common

1. Step 1. Bayonet socket — is part of — Bayonet. It fits over the barrel.
2. Step 2. Bayonet — has part — Steel blade. The bayonet blade.
3. Step 3. Steel blade — is part of — Knife. A blade with a cutting edge.
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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