Varistor and needle: what they have in common

1. Step 1. Varistor — uses — Electrical resistance. The resistance drops at high voltage.
2. Step 2. Electrical resistance — uses — Electrical conduction. Resistance is a property of a conductor.
3. Step 3. Electrical conduction — is used in — Silver. The best conductor.
4. Step 4. Silver — is material for — Syringe. Early needles were silver.
5. Step 5. Syringe — has part — Needle. A hollow needle.

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