Chain reaction and conveyor belt: what they have in common

1. Step 1. Chain reaction — is used in — Nuclear reactor. A controlled chain reaction.
2. Step 2. Nuclear reactor — is part of — Nuclear submarine. A reactor.
3. Step 3. Nuclear submarine — evolved from — Submarine. Nuclear power let submarines stay submerged for months.
4. Step 4. Submarine — is made of — Leather. It was covered with leather.
5. Step 5. Leather — is material for — Conveyor belt. The first belts were leather.

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