Screw thread and nuclear reactor: what they have in common

1. Step 1. Screw thread — evolved from — Screw. A thread is an application of the screw.
2. Step 2. Screw — is used in — Propeller. A propeller “screws” itself into the water, like an Archimedes’ screw.
3. Step 3. Propeller — is part of — Nuclear icebreaker. Propellers.
4. Step 4. Nuclear icebreaker — has part — Nuclear reactor. A reactor plant.

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