Graphite and truck: what they have in common

1. Step 1. Graphite — is material for — Supercapacitor. Electrodes made of activated carbon.
2. Step 2. Supercapacitor — is a kind of — Capacitor. A supercapacitor is a capacitor of huge capacity that charges in seconds.
3. Step 3. Capacitor — is part of — Defibrillator. The energy of the shock is stored in a capacitor.
4. Step 4. Defibrillator — is part of — Ambulance. A defibrillator.
5. Step 5. Ambulance — evolved from — Truck. A special-purpose vehicle.

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