Nuclear reactor and knife: what they have in common

1. Step 1. Nuclear reactor — is part of — Nuclear icebreaker. A reactor plant.
2. Step 2. Nuclear icebreaker — has part — Propeller. Propellers.
3. Step 3. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.
4. Step 4. Archimedes’ screw — evolved into — Auger. The Archimedes’ screw as a conveyor.
5. Step 5. Auger — is part of — Meat grinder. An auger.
6. Step 6. Meat grinder — has part — Knife. A cross-shaped blade.

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