Sakia and knife: what they have in common

1. Step 1. Sakia — is used in — Irrigation. Sakias in Egypt and India.
2. Step 2. Irrigation — uses — Archimedes’ screw. The Archimedes’ screw lifted water for irrigation.
3. Step 3. Archimedes’ screw — evolved into — Auger. The Archimedes’ screw as a conveyor.
4. Step 4. Auger — is part of — Meat grinder. An auger.
5. Step 5. Meat grinder — has part — Knife. A cross-shaped blade.

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