Tang and electric fan: what they have in common

1. Step 1. Tang — is part of — Knife. The part of the blade fixed in the handle.
2. Step 2. Knife — is part of — Meat grinder. A cross-shaped blade.
3. Step 3. Meat grinder — has part — Auger. An auger.
4. Step 4. Auger — evolved from — Archimedes’ screw. The Archimedes’ screw as a conveyor.
5. Step 5. Archimedes’ screw — evolved into — Propeller. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.
6. Step 6. Propeller — is part of — Electric fan. The blades.

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