Hydrogen car and electronic calculator: what they have in common

1. Step 1. Hydrogen car — has part — Fuel cell. A fuel cell.
2. Step 2. Fuel cell — uses — Electrochemical reaction. The reaction runs electrochemically, without combustion.
3. Step 3. Electrochemical reaction — is used in — Alkaline battery. An electrochemical reaction.
4. Step 4. Alkaline battery — is part of — Electronic calculator. A calculator runs on a battery, sometimes on a tiny solar panel.

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