Pickup truck and nuclear reactor: what they have in common

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

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