Plutonium sphere and sickle: what they have in common

1. Step 1. Plutonium sphere — is part of — Nuclear weapon. A plutonium core.
2. Step 2. Nuclear weapon — works like — Nuclear reactor. The same physics: a controlled and an uncontrolled chain reaction.
3. Step 3. Nuclear reactor — is part of — Nuclear icebreaker. A reactor plant.
4. Step 4. Nuclear icebreaker — is a kind of — Icebreaker. An icebreaker.
5. Step 5. Icebreaker — uses — Wedge. The bow rides up onto the ice and crushes it.
6. Step 6. Wedge — is used in — Sickle. The cutting edge is a wedge.

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