Nail and archimedes’ screw: what they have in common

1. Step 1. Nail — uses — Wedge. The point of a nail pushes the wood apart.
2. Step 2. Wedge — is used in — Knife. The blade cuts like a wedge.
3. Step 3. Knife — is part of — Meat grinder. A cross-shaped blade.
4. Step 4. Meat grinder — has part — Auger. An auger.
5. Step 5. Auger — evolved from — Archimedes’ screw. The Archimedes’ screw as a conveyor.

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