Neutron moderator and truck: what they have in common

1. Step 1. Neutron moderator — is part of — Nuclear reactor. A moderator.
2. Step 2. Nuclear reactor — is part of — Nuclear power plant. The reactor heats the coolant.
3. Step 3. Nuclear power plant — has part — Transformer. Transformers step up the voltage so the plant's power can travel far.
4. Step 4. Transformer — is part of — Defibrillator. Stepping up the voltage.
5. Step 5. Defibrillator — is part of — Ambulance. A defibrillator.
6. Step 6. Ambulance — evolved from — Truck. A special-purpose vehicle.

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