Car battery and glasses: what they have in common

1. Step 1. Car battery — uses — Electrochemical reaction. It stores energy electrochemically.
2. Step 2. Electrochemical reaction — is used in — Glucose meter. An electrochemical sensor.
3. Step 3. Glucose meter — has part — Liquid-crystal display. A screen.
4. Step 4. Liquid-crystal display — has part — Polarizing filter. Polarizers.
5. Step 5. Polarizing filter — is part of — Sunglasses. Polarized glasses.
6. Step 6. Sunglasses — evolved from — Glasses. Glasses with dark lenses.

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