Set of brass weights and fuel cell: what they have in common

1. Step 1. Set of brass weights — is part of — Balance scale. Reference masses.
2. Step 2. Balance scale — evolved into — Electronic scales. Electronic scales.
3. Step 3. Electronic scales — has part — Liquid-crystal display. The reading is on an LCD.
4. Step 4. Liquid-crystal display — is part of — Glucose meter. A screen.
5. Step 5. Glucose meter — uses — Electrochemical reaction. An electrochemical sensor.
6. Step 6. Electrochemical reaction — is used in — Fuel cell. The reaction runs electrochemically, without combustion.

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