Fire lance and archimedes’ screw: what they have in common

1. Step 1. Fire lance — evolved from — Spear. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
2. Step 2. Spear — has part — Stone tool. Early spearheads were made of stone.
3. Step 3. Stone tool — evolved into — Knife. The first knives were stone flakes.
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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