Defibrillator and fuel cell: what they have in common

1. Step 1. Defibrillator — evolved into — Implantable defibrillator. An implantable one.
2. Step 2. Implantable defibrillator — has part — Lithium-ion battery. Power comes from a lithium battery.
3. Step 3. Lithium-ion battery — has part — Anode (graphite). The graphite anode takes in lithium ions during charging.
4. Step 4. Anode (graphite) — is part of — Fuel cell. An anode with a catalyst for hydrogen.

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