Tetris and fuel cell: what they have in common

1. Step 1. Tetris — is used in — Handheld console. Tetris on the Game Boy.
2. Step 2. Handheld console — has part — Liquid-crystal display. An LCD screen.
3. Step 3. Liquid-crystal display — is part of — Glucose meter. A screen.
4. Step 4. Glucose meter — uses — Electrochemical reaction. An electrochemical sensor.
5. Step 5. Electrochemical reaction — is used in — Fuel cell. The reaction runs electrochemically, without combustion.

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