Nuclear weapon and bellows: what they have in common

1. Step 1. Nuclear weapon — works like — Nuclear reactor. The same physics: a controlled and an uncontrolled 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 — Bellows. Bellows are a leather bag.

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