Flat-screen TV and syringe: what they have in common

1. Step 1. Flat-screen TV — has part — Liquid-crystal display. An LCD panel.
2. Step 2. Liquid-crystal display — is part of — pH meter. An indicator.
3. Step 3. pH meter — is made of — Silver. The internal electrode is silver chloride.
4. Step 4. Silver — is material for — Syringe. Early needles were silver.

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