Silver and archimedes’ screw: what they have in common

1. Step 1. Silver — is material for — Control rod. Control rods of pressurized water reactors are a silver–indium–cadmium alloy.
2. Step 2. Control rod — is part of — Nuclear reactor. The rods control the power.
3. Step 3. Nuclear reactor — is part of — Nuclear icebreaker. A reactor plant.
4. Step 4. Nuclear icebreaker — has part — Propeller. Propellers.
5. Step 5. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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