Electrochemical reaction and typewriter: what they have in common

1. Step 1. Electrochemical reaction — is used in — Glucose meter. An electrochemical sensor.
2. Step 2. Glucose meter — has part — Liquid-crystal display. A screen.
3. Step 3. Liquid-crystal display — is part of — Laptop. An LCD screen.
4. Step 4. Laptop — has part — Keyboard. The keyboard is built into the laptop's case.
5. Step 5. Keyboard — is part of — Typewriter. The keys drive levers with type.

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