Surfboard and nuclear reactor: what they have in common

1. Step 1. Surfboard — uses — Archimedes’ principle. Buoyancy.
2. Step 2. Archimedes’ principle — is used in — Ballast tank. Changing buoyancy.
3. Step 3. Ballast tank — is part of — Submarine. Ballast tanks.
4. Step 4. Submarine — evolved into — Nuclear submarine. Nuclear power let submarines stay submerged for months.
5. Step 5. Nuclear submarine — has part — Nuclear reactor. A reactor.

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