Blood transfusion and smart meter: what they have in common

1. Step 1. Blood transfusion — uses — IV drip. A transfusion set.
2. Step 2. IV drip — has part — Syringe. A needle.
3. Step 3. Syringe — is made of — Silver. Early needles were silver.
4. Step 4. Silver — is material for — pH meter. The internal electrode is silver chloride.
5. Step 5. pH meter — has part — Liquid-crystal display. An indicator.
6. Step 6. Liquid-crystal display — is part of — Smart meter. A display.

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