Zinc and glasses: what they have in common

1. Step 1. Zinc — is material for — Alkaline battery. The anode is zinc.
2. Step 2. Alkaline battery — is part of — Electronic calculator. A calculator runs on a battery, sometimes on a tiny solar panel.
3. Step 3. Electronic calculator — has part — Liquid-crystal display. An LCD display.
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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