Tanning and nuclear reactor: what they have in common

1. Step 1. Tanning — is used in — Leather. Tanning.
2. Step 2. Leather — is material for — Submarine. It was covered with leather.
3. Step 3. Submarine — evolved into — Nuclear submarine. Nuclear power let submarines stay submerged for months.
4. Step 4. Nuclear submarine — has part — Nuclear reactor. A reactor.

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